-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-1)-13=0

We get rid of parentheses

-r+1-13=0

We add all the numbers together, and all the variables

-1r-12=0

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

-r=12

r=12/-1

r=-12

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