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9c=7c-12
We move all terms to the left:
9c-(7c-12)=0
We get rid of parentheses
9c-7c+12=0
We add all the numbers together, and all the variables
2c+12=0
We move all terms containing c to the left, all other terms to the right
2c=-12
c=-12/2
c=-6
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