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12=2c+8
We move all terms to the left:
12-(2c+8)=0
We get rid of parentheses
-2c-8+12=0
We add all the numbers together, and all the variables
-2c+4=0
We move all terms containing c to the left, all other terms to the right
-2c=-4
c=-4/-2
c=+2
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