21=2r+4r

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Solution for 21=2r+4r equation: 



21=2r+4r

We move all terms to the left:

21-(2r+4r)=0

We add all the numbers together, and all the variables

-(+6r)+21=0

We get rid of parentheses

-6r+21=0

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

-6r=-21

r=-21/-6

r=3+1/2

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