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15s-7=12s+8
We move all terms to the left:
15s-7-(12s+8)=0
We get rid of parentheses
15s-12s-8-7=0
We add all the numbers together, and all the variables
3s-15=0
We move all terms containing s to the left, all other terms to the right
3s=15
s=15/3
s=5
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