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9=-8s+7
We move all terms to the left:
9-(-8s+7)=0
We get rid of parentheses
8s-7+9=0
We add all the numbers together, and all the variables
8s+2=0
We move all terms containing s to the left, all other terms to the right
8s=-2
s=-2/8
s=-1/4
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