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-13-6c=-3c+20
We move all terms to the left:
-13-6c-(-3c+20)=0
We get rid of parentheses
-6c+3c-20-13=0
We add all the numbers together, and all the variables
-3c-33=0
We move all terms containing c to the left, all other terms to the right
-3c=33
c=33/-3
c=-11
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