9=3(u+7)-7u

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



9=3(u+7)-7u

We move all terms to the left:

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



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

3(u+7)-7u

We add all the numbers together, and all the variables

-7u+3(u+7)

We multiply parentheses

-7u+3u+21

We add all the numbers together, and all the variables

-4u+21

Back to the equation:

-(-4u+21)



We get rid of parentheses

4u-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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