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9c=12-12c
We move all terms to the left:
9c-(12-12c)=0
We add all the numbers together, and all the variables
9c-(-12c+12)=0
We get rid of parentheses
9c+12c-12=0
We add all the numbers together, and all the variables
21c-12=0
We move all terms containing c to the left, all other terms to the right
21c=12
c=12/21
c=4/7
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