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