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-10s+7=-8s-9
We move all terms to the left:
-10s+7-(-8s-9)=0
We get rid of parentheses
-10s+8s+9+7=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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