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3c-15=c+15
We move all terms to the left:
3c-15-(c+15)=0
We get rid of parentheses
3c-c-15-15=0
We add all the numbers together, and all the variables
2c-30=0
We move all terms containing c to the left, all other terms to the right
2c=30
c=30/2
c=15
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