-15=9+3u

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Solution for -15=9+3u equation: 



-15=9+3u

We move all terms to the left:

-15-(9+3u)=0

We add all the numbers together, and all the variables

-(3u+9)-15=0

We get rid of parentheses

-3u-9-15=0

We add all the numbers together, and all the variables

-3u-24=0

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

-3u=24

u=24/-3

u=-8

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