31=10+7s

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Solution for 31=10+7s equation: 



31=10+7s

We move all terms to the left:

31-(10+7s)=0

We add all the numbers together, and all the variables

-(7s+10)+31=0

We get rid of parentheses

-7s-10+31=0

We add all the numbers together, and all the variables

-7s+21=0

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

-7s=-21

s=-21/-7

s=+3

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