4=r/9

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Solution for 4=r/9 equation: 



4=r/9

We move all terms to the left:

4-(r/9)=0

We add all the numbers together, and all the variables

-(+r/9)+4=0

We get rid of parentheses

-r/9+4=0

We multiply all the terms by the denominator


-r+4*9=0

We add all the numbers together, and all the variables

-1r+36=0

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

-r=-36

r=-36/-1

r=+36

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