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-28=-5s+7s
We move all terms to the left:
-28-(-5s+7s)=0
We add all the numbers together, and all the variables
-(+2s)-28=0
We get rid of parentheses
-2s-28=0
We move all terms containing s to the left, all other terms to the right
-2s=28
s=28/-2
s=-14
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