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-17=8s+7s
We move all terms to the left:
-17-(8s+7s)=0
We add all the numbers together, and all the variables
-(+15s)-17=0
We get rid of parentheses
-15s-17=0
We move all terms containing s to the left, all other terms to the right
-15s=17
s=17/-15
s=-1+2/15
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