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13=20c+39
We move all terms to the left:
13-(20c+39)=0
We get rid of parentheses
-20c-39+13=0
We add all the numbers together, and all the variables
-20c-26=0
We move all terms containing c to the left, all other terms to the right
-20c=26
c=26/-20
c=-1+3/10
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