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6c-42=7c-56
We move all terms to the left:
6c-42-(7c-56)=0
We get rid of parentheses
6c-7c+56-42=0
We add all the numbers together, and all the variables
-1c+14=0
We move all terms containing c to the left, all other terms to the right
-c=-14
c=-14/-1
c=+14
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