21=3r-6

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Solution for 21=3r-6 equation: 



21=3r-6

We move all terms to the left:

21-(3r-6)=0

We get rid of parentheses

-3r+6+21=0

We add all the numbers together, and all the variables

-3r+27=0

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

-3r=-27

r=-27/-3

r=+9

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