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5c-15=2c+c
We move all terms to the left:
5c-15-(2c+c)=0
We add all the numbers together, and all the variables
5c-(+3c)-15=0
We get rid of parentheses
5c-3c-15=0
We add all the numbers together, and all the variables
2c-15=0
We move all terms containing c to the left, all other terms to the right
2c=15
c=15/2
c=7+1/2
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