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-10-7s=-9s
We move all terms to the left:
-10-7s-(-9s)=0
We get rid of parentheses
-7s+9s-10=0
We add all the numbers together, and all the variables
2s-10=0
We move all terms containing s to the left, all other terms to the right
2s=10
s=10/2
s=5
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