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12=5s-s
We move all terms to the left:
12-(5s-s)=0
We add all the numbers together, and all the variables
-(+4s)+12=0
We get rid of parentheses
-4s+12=0
We move all terms containing s to the left, all other terms to the right
-4s=-12
s=-12/-4
s=+3
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