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+6=0

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

-3u=-6

u=-6/-3

u=+2

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