closed as unclear what you're asking by Joe, JMP, PerpetualJ, Glorfindel, rhsquared Oct 17 '18 at 16:38
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You'll note that there are a lot of similarities between
The shape of the 8 and the shape of the 3.
So what the equation is saying is that
If we visually take a 3-shaped curve out of the 8-shape, we're left with a 7.
The trick answer (cf 'lateral thinking' tag) is to remove the element of equality. This works for both equations.
Admittedly, it does nothing for the 'visual' tag, other than that the element of equality covers the whole spatially finished equation in each case.
Another way to see the equation:
Remove $-$ sign from $8 - 3 = 7 $, and add the slant line on $=$ sign: $$ 83 \neq 7$$
It works with $ 8 + 3 = 7 $ also.
Question is very vague and I have asked OP to clarify in a comment to the question.
Meanwhile, I think to solve an "equation" we require an "unknown".
Here, the 7 is not a 7, rather it is part of a question mark "?" which is the "unknown" in the "equation" and hence 8-3=? is 8-3=5.
Similarly 8+3=? is 8+3=11.