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-8s+7=-7s
We move all terms to the left:
-8s+7-(-7s)=0
We get rid of parentheses
-8s+7s+7=0
We add all the numbers together, and all the variables
-1s+7=0
We move all terms containing s to the left, all other terms to the right
-s=-7
s=-7/-1
s=+7
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