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-15-17s=-12s
We move all terms to the left:
-15-17s-(-12s)=0
We get rid of parentheses
-17s+12s-15=0
We add all the numbers together, and all the variables
-5s-15=0
We move all terms containing s to the left, all other terms to the right
-5s=15
s=15/-5
s=-3
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