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5s-89=2s+4
We move all terms to the left:
5s-89-(2s+4)=0
We get rid of parentheses
5s-2s-4-89=0
We add all the numbers together, and all the variables
3s-93=0
We move all terms containing s to the left, all other terms to the right
3s=93
s=93/3
s=31
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