13=-7+c

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Solution for 13=-7+c equation: 



13=-7+c

We move all terms to the left:

13-(-7+c)=0

We add all the numbers together, and all the variables

-(c-7)+13=0

We get rid of parentheses

-c+7+13=0

We add all the numbers together, and all the variables

-1c+20=0

We move all terms containing c to the left, all other terms to the right

-c=-20

c=-20/-1

c=+20

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