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12=3c-12+6c
We move all terms to the left:
12-(3c-12+6c)=0
We add all the numbers together, and all the variables
-(9c-12)+12=0
We get rid of parentheses
-9c+12+12=0
We add all the numbers together, and all the variables
-9c+24=0
We move all terms containing c to the left, all other terms to the right
-9c=-24
c=-24/-9
c=2+2/3
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