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-18=3s+3s
We move all terms to the left:
-18-(3s+3s)=0
We add all the numbers together, and all the variables
-(+6s)-18=0
We get rid of parentheses
-6s-18=0
We move all terms containing s to the left, all other terms to the right
-6s=18
s=18/-6
s=-3
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