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15c-4=12c+15
We move all terms to the left:
15c-4-(12c+15)=0
We get rid of parentheses
15c-12c-15-4=0
We add all the numbers together, and all the variables
3c-19=0
We move all terms containing c to the left, all other terms to the right
3c=19
c=19/3
c=6+1/3
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