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

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



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

We move all terms to the left:

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



We calculate terms in parentheses: -(3(u-1)), so:

3(u-1)

We multiply parentheses

3u-3

Back to the equation:

-(3u-3)



We get rid of parentheses

-9u-3u+3+21=0

We add all the numbers together, and all the variables

-12u+24=0

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

-12u=-24

u=-24/-12

u=+2

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