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2s+12=4s-18
We move all terms to the left:
2s+12-(4s-18)=0
We get rid of parentheses
2s-4s+18+12=0
We add all the numbers together, and all the variables
-2s+30=0
We move all terms containing s to the left, all other terms to the right
-2s=-30
s=-30/-2
s=+15
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