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4=12-4s
We move all terms to the left:
4-(12-4s)=0
We add all the numbers together, and all the variables
-(-4s+12)+4=0
We get rid of parentheses
4s-12+4=0
We add all the numbers together, and all the variables
4s-8=0
We move all terms containing s to the left, all other terms to the right
4s=8
s=8/4
s=2
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