13=r+-4

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Solution for 13=r+-4 equation: 



13=r+-4

We move all terms to the left:

13-(r+-4)=0

We add all the numbers together, and all the variables

-(r-4)+13=0

We get rid of parentheses

-r+4+13=0

We add all the numbers together, and all the variables

-1r+17=0

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

-r=-17

r=-17/-1

r=+17

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