-15=3(u+3)+3u

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Solution for -15=3(u+3)+3u equation: 



-15=3(u+3)+3u

We move all terms to the left:

-15-(3(u+3)+3u)=0



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

3(u+3)+3u

We add all the numbers together, and all the variables

3u+3(u+3)

We multiply parentheses

3u+3u+9

We add all the numbers together, and all the variables

6u+9

Back to the equation:

-(6u+9)



We get rid of parentheses

-6u-9-15=0

We add all the numbers together, and all the variables

-6u-24=0

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

-6u=24

u=24/-6

u=-4

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