-9=3+3u

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Solution for -9=3+3u equation: 



-9=3+3u

We move all terms to the left:

-9-(3+3u)=0

We add all the numbers together, and all the variables

-(3u+3)-9=0

We get rid of parentheses

-3u-3-9=0

We add all the numbers together, and all the variables

-3u-12=0

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

-3u=12

u=12/-3

u=-4

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