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18=4c+12+2c
We move all terms to the left:
18-(4c+12+2c)=0
We add all the numbers together, and all the variables
-(6c+12)+18=0
We get rid of parentheses
-6c-12+18=0
We add all the numbers together, and all the variables
-6c+6=0
We move all terms containing c to the left, all other terms to the right
-6c=-6
c=-6/-6
c=1
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