6u-21=3(u-1)

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Solution for 6u-21=3(u-1) equation: 



6u-21=3(u-1)

We move all terms to the left:

6u-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

6u-3u+3-21=0

We add all the numbers together, and all the variables

3u-18=0

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

3u=18

u=18/3

u=6

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