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4=8s-7s
We move all terms to the left:
4-(8s-7s)=0
We add all the numbers together, and all the variables
-(+s)+4=0
We get rid of parentheses
-s+4=0
We add all the numbers together, and all the variables
-1s+4=0
We move all terms containing s to the left, all other terms to the right
-s=-4
s=-4/-1
s=+4
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