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13=c/2=9
We move all terms to the left:
13-(c/2)=0
We add all the numbers together, and all the variables
-(+c/2)+13=0
We get rid of parentheses
-c/2+13=0
We multiply all the terms by the denominator
-c+13*2=0
We add all the numbers together, and all the variables
-1c+26=0
We move all terms containing c to the left, all other terms to the right
-c=-26
c=-26/-1
c=+26
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