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-42=-5c-c
We move all terms to the left:
-42-(-5c-c)=0
We add all the numbers together, and all the variables
-(-6c)-42=0
We get rid of parentheses
6c-42=0
We move all terms containing c to the left, all other terms to the right
6c=42
c=42/6
c=7
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