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c-66=c+c+c+c
We move all terms to the left:
c-66-(c+c+c+c)=0
We add all the numbers together, and all the variables
c-(+4c)-66=0
We get rid of parentheses
c-4c-66=0
We add all the numbers together, and all the variables
-3c-66=0
We move all terms containing c to the left, all other terms to the right
-3c=66
c=66/-3
c=-22
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