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s=5s-80
We move all terms to the left:
s-(5s-80)=0
We get rid of parentheses
s-5s+80=0
We add all the numbers together, and all the variables
-4s+80=0
We move all terms containing s to the left, all other terms to the right
-4s=-80
s=-80/-4
s=+20
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