-13=r+9+8

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Solution for -13=r+9+8 equation: 



-13=r+9+8

We move all terms to the left:

-13-(r+9+8)=0

We add all the numbers together, and all the variables

-(r+17)-13=0

We get rid of parentheses

-r-17-13=0

We add all the numbers together, and all the variables

-1r-30=0

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

-r=30

r=30/-1

r=-30

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