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s=5s-84
We move all terms to the left:
s-(5s-84)=0
We get rid of parentheses
s-5s+84=0
We add all the numbers together, and all the variables
-4s+84=0
We move all terms containing s to the left, all other terms to the right
-4s=-84
s=-84/-4
s=+21
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