13=-23+r

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Solution for 13=-23+r equation: 



13=-23+r

We move all terms to the left:

13-(-23+r)=0

We add all the numbers together, and all the variables

-(r-23)+13=0

We get rid of parentheses

-r+23+13=0

We add all the numbers together, and all the variables

-1r+36=0

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

-r=-36

r=-36/-1

r=+36

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