-9=6+3u

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Solution for -9=6+3u equation: 



-9=6+3u

We move all terms to the left:

-9-(6+3u)=0

We add all the numbers together, and all the variables

-(3u+6)-9=0

We get rid of parentheses

-3u-6-9=0

We add all the numbers together, and all the variables

-3u-15=0

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

-3u=15

u=15/-3

u=-5

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