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2s=8s-84
We move all terms to the left:
2s-(8s-84)=0
We get rid of parentheses
2s-8s+84=0
We add all the numbers together, and all the variables
-6s+84=0
We move all terms containing s to the left, all other terms to the right
-6s=-84
s=-84/-6
s=+14
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