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