21=u+2u

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Solution for 21=u+2u equation: 



21=u+2u

We move all terms to the left:

21-(u+2u)=0

We add all the numbers together, and all the variables

-(+3u)+21=0

We get rid of parentheses

-3u+21=0

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

-3u=-21

u=-21/-3

u=+7

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