13=9+r/3

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Solution for 13=9+r/3 equation: 



13=9+r/3

We move all terms to the left:

13-(9+r/3)=0

We add all the numbers together, and all the variables

-(r/3+9)+13=0

We get rid of parentheses

-r/3-9+13=0

We multiply all the terms by the denominator


-r-9*3+13*3=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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