-15=7(u+3)+2u

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Solution for -15=7(u+3)+2u equation: 



-15=7(u+3)+2u

We move all terms to the left:

-15-(7(u+3)+2u)=0



We calculate terms in parentheses: -(7(u+3)+2u), so:

7(u+3)+2u

We add all the numbers together, and all the variables

2u+7(u+3)

We multiply parentheses

2u+7u+21

We add all the numbers together, and all the variables

9u+21

Back to the equation:

-(9u+21)



We get rid of parentheses

-9u-21-15=0

We add all the numbers together, and all the variables

-9u-36=0

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

-9u=36

u=36/-9

u=-4

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