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8c-2c-4c+3c-3c=12
We move all terms to the left:
8c-2c-4c+3c-3c-(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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