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3c+15=c+7c=
We move all terms to the left:
3c+15-(c+7c)=0
We add all the numbers together, and all the variables
3c-(+8c)+15=0
We get rid of parentheses
3c-8c+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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