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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