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-42+4c=-c-3c-c
We move all terms to the left:
-42+4c-(-c-3c-c)=0
We add all the numbers together, and all the variables
4c-(-5c)-42=0
We get rid of parentheses
4c+5c-42=0
We add all the numbers together, and all the variables
9c-42=0
We move all terms containing c to the left, all other terms to the right
9c=42
c=42/9
c=4+2/3
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