21=6r+r

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Solution for 21=6r+r equation: 



21=6r+r

We move all terms to the left:

21-(6r+r)=0

We add all the numbers together, and all the variables

-(+7r)+21=0

We get rid of parentheses

-7r+21=0

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

-7r=-21

r=-21/-7

r=+3

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