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-10s-9=-3s
We move all terms to the left:
-10s-9-(-3s)=0
We get rid of parentheses
-10s+3s-9=0
We add all the numbers together, and all the variables
-7s-9=0
We move all terms containing s to the left, all other terms to the right
-7s=9
s=9/-7
s=-1+2/7
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