3u-21=9(u+1)

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Solution for 3u-21=9(u+1) equation: 



3u-21=9(u+1)

We move all terms to the left:

3u-21-(9(u+1))=0



We calculate terms in parentheses: -(9(u+1)), so:

9(u+1)

We multiply parentheses

9u+9

Back to the equation:

-(9u+9)



We get rid of parentheses

3u-9u-9-21=0

We add all the numbers together, and all the variables

-6u-30=0

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

-6u=30

u=30/-6

u=-5

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