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4c+3c+3c-10c+4c=12
We move all terms to the left:
4c+3c+3c-10c+4c-(12)=0
We add all the numbers together, and all the variables
4c-12=0
We move all terms containing c to the left, all other terms to the right
4c=12
c=12/4
c=3
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