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