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8-9s=-7s
We move all terms to the left:
8-9s-(-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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