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-12=-4s+8s
We move all terms to the left:
-12-(-4s+8s)=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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