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15c+7=12c-3
We move all terms to the left:
15c+7-(12c-3)=0
We get rid of parentheses
15c-12c+3+7=0
We add all the numbers together, and all the variables
3c+10=0
We move all terms containing c to the left, all other terms to the right
3c=-10
c=-10/3
c=-3+1/3
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