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-18+11s=15+9s-9
We move all terms to the left:
-18+11s-(15+9s-9)=0
We add all the numbers together, and all the variables
11s-(9s+6)-18=0
We get rid of parentheses
11s-9s-6-18=0
We add all the numbers together, and all the variables
2s-24=0
We move all terms containing s to the left, all other terms to the right
2s=24
s=24/2
s=12
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