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27=15+s
We move all terms to the left:
27-(15+s)=0
We add all the numbers together, and all the variables
-(s+15)+27=0
We get rid of parentheses
-s-15+27=0
We add all the numbers together, and all the variables
-1s+12=0
We move all terms containing s to the left, all other terms to the right
-s=-12
s=-12/-1
s=+12
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