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80=9s+7s
We move all terms to the left:
80-(9s+7s)=0
We add all the numbers together, and all the variables
-(+16s)+80=0
We get rid of parentheses
-16s+80=0
We move all terms containing s to the left, all other terms to the right
-16s=-80
s=-80/-16
s=+5
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