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10c+42=6c+66
We move all terms to the left:
10c+42-(6c+66)=0
We get rid of parentheses
10c-6c-66+42=0
We add all the numbers together, and all the variables
4c-24=0
We move all terms containing c to the left, all other terms to the right
4c=24
c=24/4
c=6
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