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