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-2s+5=-7s
We move all terms to the left:
-2s+5-(-7s)=0
We get rid of parentheses
-2s+7s+5=0
We add all the numbers together, and all the variables
5s+5=0
We move all terms containing s to the left, all other terms to the right
5s=-5
s=-5/5
s=-1
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