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This is inspired by/alternative to Olba12's nice answer:

30
= 10 + 10 + 10
= (11 - 1) + (11 - 1) + (9 - 1)
= 31 - 3
= 31 - 2 - 1
= 29 - 1

$$\begin{align} 30 &= 10 + 10 + 10\\ &= (11 - 1) + (11 - 1) + (9 - 1)\\ &= 31 - 3\\ &= 31 - 2 - 1\\ &= 29 - 1 \end{align}$$

Hence: 29 - 1 = 30$29 - 1 = 30$.

This is inspired by/alternative to Olba12's nice answer:

30
= 10 + 10 + 10
= (11 - 1) + (11 - 1) + (9 - 1)
= 31 - 3
= 31 - 2 - 1
= 29 - 1

Hence: 29 - 1 = 30.

This is inspired by/alternative to Olba12's nice answer:

$$\begin{align} 30 &= 10 + 10 + 10\\ &= (11 - 1) + (11 - 1) + (9 - 1)\\ &= 31 - 3\\ &= 31 - 2 - 1\\ &= 29 - 1 \end{align}$$

Hence: $29 - 1 = 30$.

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created Jun 12, 2017 at 11:47

This is inspired by/alternative to Olba12's nice answer:

30
= 10 + 10 + 10
= (11 - 1) + (11 - 1) + (9 - 1)
= 31 - 3
= 31 - 2 - 1
= 29 - 1

Hence: 29 - 1 = 30.