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12=3c+4c-2
We move all terms to the left:
12-(3c+4c-2)=0
We add all the numbers together, and all the variables
-(7c-2)+12=0
We get rid of parentheses
-7c+2+12=0
We add all the numbers together, and all the variables
-7c+14=0
We move all terms containing c to the left, all other terms to the right
-7c=-14
c=-14/-7
c=+2
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