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13=-4+c
We move all terms to the left:
13-(-4+c)=0
We add all the numbers together, and all the variables
-(c-4)+13=0
We get rid of parentheses
-c+4+13=0
We add all the numbers together, and all the variables
-1c+17=0
We move all terms containing c to the left, all other terms to the right
-c=-17
c=-17/-1
c=+17
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