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8s+120=3s-42
We move all terms to the left:
8s+120-(3s-42)=0
We get rid of parentheses
8s-3s+42+120=0
We add all the numbers together, and all the variables
5s+162=0
We move all terms containing s to the left, all other terms to the right
5s=-162
s=-162/5
s=-32+2/5
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