s+(s+7)=31

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Solution for s+(s+7)=31 equation: 



s+(s+7)=31

We move all terms to the left:

s+(s+7)-(31)=0

We get rid of parentheses

s+s+7-31=0

We add all the numbers together, and all the variables

2s-24=0

We move all terms containing s to the left, all other terms to the right

2s=24

s=24/2

s=12

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