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-2C=C-12
We move all terms to the left:
-2C-(C-12)=0
We get rid of parentheses
-2C-C+12=0
We add all the numbers together, and all the variables
-3C+12=0
We move all terms containing C to the left, all other terms to the right
-3C=-12
C=-12/-3
C=+4
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