13=r/9+4

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Solution for 13=r/9+4 equation: 



13=r/9+4

We move all terms to the left:

13-(r/9+4)=0

We get rid of parentheses

-r/9-4+13=0

We multiply all the terms by the denominator


-r-4*9+13*9=0

We add all the numbers together, and all the variables

-1r+81=0

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

-r=-81

r=-81/-1

r=+81

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