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12=12s-12
We move all terms to the left:
12-(12s-12)=0
We get rid of parentheses
-12s+12+12=0
We add all the numbers together, and all the variables
-12s+24=0
We move all terms containing s to the left, all other terms to the right
-12s=-24
s=-24/-12
s=+2
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