3u+9=7(u+3)

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Solution for 3u+9=7(u+3) equation: 



3u+9=7(u+3)

We move all terms to the left:

3u+9-(7(u+3))=0



We calculate terms in parentheses: -(7(u+3)), so:

7(u+3)

We multiply parentheses

7u+21

Back to the equation:

-(7u+21)



We get rid of parentheses

3u-7u-21+9=0

We add all the numbers together, and all the variables

-4u-12=0

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

-4u=12

u=12/-4

u=-3

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