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2s-15=8s+9
We move all terms to the left:
2s-15-(8s+9)=0
We get rid of parentheses
2s-8s-9-15=0
We add all the numbers together, and all the variables
-6s-24=0
We move all terms containing s to the left, all other terms to the right
-6s=24
s=24/-6
s=-4
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