-9+9s=7s+7

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Solution for -9+9s=7s+7 equation: 



-9+9s=7s+7

We move all terms to the left:

-9+9s-(7s+7)=0

We get rid of parentheses

9s-7s-7-9=0

We add all the numbers together, and all the variables

2s-16=0

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

2s=16

s=16/2

s=8

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