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-6=3S+12
We move all terms to the left:
-6-(3S+12)=0
We get rid of parentheses
-3S-12-6=0
We add all the numbers together, and all the variables
-3S-18=0
We move all terms containing S to the left, all other terms to the right
-3S=18
S=18/-3
S=-6
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