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-20+10c=13c+19
We move all terms to the left:
-20+10c-(13c+19)=0
We get rid of parentheses
10c-13c-19-20=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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