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Move two lines to make the equation true.

enter image description here

As always, no inequality symbol (≠), adding, and subtracting lines. Move the lines only.

Hint 1:

To find the answer, you only have to affect one side.

Hint 2:

Do not rotate lines as well.

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    $\begingroup$ This is honestly terrible unless there's an actual answer. $\endgroup$ Feb 19 at 7:21

12 Answers 12

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Move two vertical lines from 7 to the left, to get:

enter image description here

Explanation:

Italy calling country code is +39. Many sites and documents do not explicitly use "+" sign.

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    $\begingroup$ So + sign is not needed? $\endgroup$
    – DrD
    Feb 20 at 13:11
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Here's a more conventional answer:

enter image description here

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    $\begingroup$ Didn't think of that, pretty clever ! $\endgroup$
    – Auribouros
    Feb 18 at 15:24
  • $\begingroup$ @Auribouros Thanks. Isn't quite in keeping with the hint, but still. $\endgroup$
    – Nautilus
    Feb 18 at 16:25
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    $\begingroup$ @justhalf Yup. :) $\endgroup$
    – Nautilus
    Feb 19 at 10:32
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    $\begingroup$ Shocked that this wasn't it... $\endgroup$
    – Avi
    Feb 19 at 23:47
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    $\begingroup$ Your points are invalid: (1) 1^0 also = 1, so it's valid (2) If a hint precludes an otherwise valid solution it should be in the puzzle itself, not posted later (3) If you count properly, exactly two matchsticks have been moved (red matchsticks are moved to green positions) $\endgroup$
    – Avi
    Feb 20 at 8:20
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Using Lateral Thinking you can rotate the equation 180 degrees and move 2 sticks to get

Sb = LI or

enter image description here

Reason is

Sb is Antimony in the Periodic Table with atomic number 51 and LI is 51 in Roman Numeral!

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17 < 39
(17 is less than 39)

enter image description here

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  • $\begingroup$ Welcome to the puzzling stackexchange. Please make sure to use spoiler tags next time (by prepending your answer with >! ). I went ahead and edited your post to do so (and I also added a picture). Nice answer though, so +1 from me. $\endgroup$ Feb 19 at 21:50
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In line with the hint and the lateral thinking tag.

17
17=17, where the right hand side are the

I am not entirely convinced with myself because the seven looks clunky.

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If you use , you can

flip the image 180 degrees, and move the sticks from the 1 to get the letter "b", which is phonetically equivalent to "be". The equation 17 = 39 in matchsticks, flipped upside down. The sticks from the 1 in 17 have been moved to turn the upside-down 7 into the letter b. The upside-down 39 reads as the letters b and e.

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If the left side is Celsius, and the right side is Fahrenheit, then with 3 non-rotation moves on the right side only, you can get 17=63

Notes:

Since modifications should be limited to one side of the equation, and you can't rotate, we can infer that the 17 will not change (because you must use all 4 verticals, only "8" has 4 verticals, but there aren't enough horizontals).

So if we assume the 17 is constant, there must be some regime where 17 matches some other number. (I'm discounting base32 and base10 for this answer, since 2 moves are required.)

17C equals 62.6F, which if we round up, then 63 can be achieved with 3 non-rotating moves.

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enter image description here

Because

Both sides follow different number systems, LHS is in hex and RHS is in decimal and 17 in hex is 23 in decimal

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    $\begingroup$ 17 in base 32 equals 39 in decimal already. $\endgroup$
    – Bass
    Feb 18 at 8:53
  • $\begingroup$ Can be said that base 32 is "too long" (long=32 bits) $\endgroup$
    – RedBaron
    Feb 22 at 12:34
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My thinking was to move two sticks from the right to the left to get something like this

enter image description here

indicating that

The "crossed seven" is to be interpreted in the same way as a regular seven.

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Another possibility:

Using different numbering systems

Move two sticks to create LI = 33, or, Roman Numeral 51 = Hexadecimal 51

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I'll give my shot:

11 = 34x

A mathematically sound equation... just likely not what the OP was looking for.

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  • $\begingroup$ I don't understand? $\endgroup$ Feb 20 at 16:05
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The equation is already true, if the left side is base32, and the right side is base10.

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