21=r/9

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Solution for 21=r/9 equation: 



21=r/9

We move all terms to the left:

21-(r/9)=0

We add all the numbers together, and all the variables

-(+r/9)+21=0

We get rid of parentheses

-r/9+21=0

We multiply all the terms by the denominator


-r+21*9=0

We add all the numbers together, and all the variables

-1r+189=0

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

-r=-189

r=-189/-1

r=+189

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