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12s+3+8s=19s+18
We move all terms to the left:
12s+3+8s-(19s+18)=0
We add all the numbers together, and all the variables
20s-(19s+18)+3=0
We get rid of parentheses
20s-19s-18+3=0
We add all the numbers together, and all the variables
s-15=0
We move all terms containing s to the left, all other terms to the right
s=15
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