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8s-9=10s+9
We move all terms to the left:
8s-9-(10s+9)=0
We get rid of parentheses
8s-10s-9-9=0
We add all the numbers together, and all the variables
-2s-18=0
We move all terms containing s to the left, all other terms to the right
-2s=18
s=18/-2
s=-9
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