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7c+12=4c-78
We move all terms to the left:
7c+12-(4c-78)=0
We get rid of parentheses
7c-4c+78+12=0
We add all the numbers together, and all the variables
3c+90=0
We move all terms containing c to the left, all other terms to the right
3c=-90
c=-90/3
c=-30
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