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-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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