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-8+2(-7s-10)=-7s
We move all terms to the left:
-8+2(-7s-10)-(-7s)=0
We multiply parentheses
-14s-(-7s)-20-8=0
We get rid of parentheses
-14s+7s-20-8=0
We add all the numbers together, and all the variables
-7s-28=0
We move all terms containing s to the left, all other terms to the right
-7s=28
s=28/-7
s=-4
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