6u-21=3(u+3)

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



6u-21=3(u+3)

We move all terms to the left:

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



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

3(u+3)

We multiply parentheses

3u+9

Back to the equation:

-(3u+9)



We get rid of parentheses

6u-3u-9-21=0

We add all the numbers together, and all the variables

3u-30=0

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

3u=30

u=30/3

u=10

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