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-9(s+9)=63
We move all terms to the left:
-9(s+9)-(63)=0
We multiply parentheses
-9s-81-63=0
We add all the numbers together, and all the variables
-9s-144=0
We move all terms containing s to the left, all other terms to the right
-9s=144
s=144/-9
s=-16
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