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13c-13c+3c-3c+4c=16
We move all terms to the left:
13c-13c+3c-3c+4c-(16)=0
We add all the numbers together, and all the variables
4c-16=0
We move all terms containing c to the left, all other terms to the right
4c=16
c=16/4
c=4
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