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4c=15-c
We move all terms to the left:
4c-(15-c)=0
We add all the numbers together, and all the variables
4c-(-1c+15)=0
We get rid of parentheses
4c+1c-15=0
We add all the numbers together, and all the variables
5c-15=0
We move all terms containing c to the left, all other terms to the right
5c=15
c=15/5
c=3
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