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7c-7c+2c+3c-2c=12
We move all terms to the left:
7c-7c+2c+3c-2c-(12)=0
We add all the numbers together, and all the variables
3c-12=0
We move all terms containing c to the left, all other terms to the right
3c=12
c=12/3
c=4
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