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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