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