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4(5c+1)-42=15c+2
We move all terms to the left:
4(5c+1)-42-(15c+2)=0
We multiply parentheses
20c-(15c+2)+4-42=0
We get rid of parentheses
20c-15c-2+4-42=0
We add all the numbers together, and all the variables
5c-40=0
We move all terms containing c to the left, all other terms to the right
5c=40
c=40/5
c=8
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