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s+15=2s+8
We move all terms to the left:
s+15-(2s+8)=0
We get rid of parentheses
s-2s-8+15=0
We add all the numbers together, and all the variables
-1s+7=0
We move all terms containing s to the left, all other terms to the right
-s=-7
s=-7/-1
s=+7
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