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9+10s=-7s-8
We move all terms to the left:
9+10s-(-7s-8)=0
We get rid of parentheses
10s+7s+8+9=0
We add all the numbers together, and all the variables
17s+17=0
We move all terms containing s to the left, all other terms to the right
17s=-17
s=-17/17
s=-1
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