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13=c/3+15
We move all terms to the left:
13-(c/3+15)=0
We get rid of parentheses
-c/3-15+13=0
We multiply all the terms by the denominator
-c-15*3+13*3=0
We add all the numbers together, and all the variables
-1c-6=0
We move all terms containing c to the left, all other terms to the right
-c=6
c=6/-1
c=-6
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