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15c+2c-13c-4c+3c=15
We move all terms to the left:
15c+2c-13c-4c+3c-(15)=0
We add all the numbers together, and all the variables
3c-15=0
We move all terms containing c to the left, all other terms to the right
3c=15
c=15/3
c=5
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