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18=2+4c
We move all terms to the left:
18-(2+4c)=0
We add all the numbers together, and all the variables
-(4c+2)+18=0
We get rid of parentheses
-4c-2+18=0
We add all the numbers together, and all the variables
-4c+16=0
We move all terms containing c to the left, all other terms to the right
-4c=-16
c=-16/-4
c=+4
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