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-7(s-9)=56
We move all terms to the left:
-7(s-9)-(56)=0
We multiply parentheses
-7s+63-56=0
We add all the numbers together, and all the variables
-7s+7=0
We move all terms containing s to the left, all other terms to the right
-7s=-7
s=-7/-7
s=1
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