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-12s+18=-6s
We move all terms to the left:
-12s+18-(-6s)=0
We get rid of parentheses
-12s+6s+18=0
We add all the numbers together, and all the variables
-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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