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8s-1=s+20
We move all terms to the left:
8s-1-(s+20)=0
We get rid of parentheses
8s-s-20-1=0
We add all the numbers together, and all the variables
7s-21=0
We move all terms containing s to the left, all other terms to the right
7s=21
s=21/7
s=3
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