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31=4s-8s
We move all terms to the left:
31-(4s-8s)=0
We add all the numbers together, and all the variables
-(-4s)+31=0
We get rid of parentheses
4s+31=0
We move all terms containing s to the left, all other terms to the right
4s=-31
s=-31/4
s=-7+3/4
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