13=-6+r

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Solution for 13=-6+r equation: 



13=-6+r

We move all terms to the left:

13-(-6+r)=0

We add all the numbers together, and all the variables

-(r-6)+13=0

We get rid of parentheses

-r+6+13=0

We add all the numbers together, and all the variables

-1r+19=0

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

-r=-19

r=-19/-1

r=+19

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