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-9s-8=-7s
We move all terms to the left:
-9s-8-(-7s)=0
We get rid of parentheses
-9s+7s-8=0
We add all the numbers together, and all the variables
-2s-8=0
We move all terms containing s to the left, all other terms to the right
-2s=8
s=8/-2
s=-4
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