-13=9/r+8

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



-13=9/r+8

We move all terms to the left:

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



Domain of the equation: r+8)!=0

r∈R



We get rid of parentheses

-9/r-8-13=0

We multiply all the terms by the denominator


-8*r-13*r-9=0

We add all the numbers together, and all the variables

-21r-9=0

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

-21r=9

r=9/-21

r=-3/7

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