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-10-9s=10-7s
We move all terms to the left:
-10-9s-(10-7s)=0
We add all the numbers together, and all the variables
-9s-(-7s+10)-10=0
We get rid of parentheses
-9s+7s-10-10=0
We add all the numbers together, and all the variables
-2s-20=0
We move all terms containing s to the left, all other terms to the right
-2s=20
s=20/-2
s=-10
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