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4c-19+19c=20+20c
We move all terms to the left:
4c-19+19c-(20+20c)=0
We add all the numbers together, and all the variables
4c+19c-(20c+20)-19=0
We add all the numbers together, and all the variables
23c-(20c+20)-19=0
We get rid of parentheses
23c-20c-20-19=0
We add all the numbers together, and all the variables
3c-39=0
We move all terms containing c to the left, all other terms to the right
3c=39
c=39/3
c=13
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