21=(6u-3u)

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Solution for 21=(6u-3u) equation: 



21=(6u-3u)

We move all terms to the left:

21-((6u-3u))=0

We add all the numbers together, and all the variables

-((+3u))+21=0



We calculate terms in parentheses: -((+3u)), so:

(+3u)

We get rid of parentheses

3u

Back to the equation:

-(3u)



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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