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3c-12=c-4
We move all terms to the left:
3c-12-(c-4)=0
We get rid of parentheses
3c-c+4-12=0
We add all the numbers together, and all the variables
2c-8=0
We move all terms containing c to the left, all other terms to the right
2c=8
c=8/2
c=4
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