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13=2c-1
We move all terms to the left:
13-(2c-1)=0
We get rid of parentheses
-2c+1+13=0
We add all the numbers together, and all the variables
-2c+14=0
We move all terms containing c to the left, all other terms to the right
-2c=-14
c=-14/-2
c=+7
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