21=9r-6

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Solution for 21=9r-6 equation: 



21=9r-6

We move all terms to the left:

21-(9r-6)=0

We get rid of parentheses

-9r+6+21=0

We add all the numbers together, and all the variables

-9r+27=0

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

-9r=-27

r=-27/-9

r=+3

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