2=9+u

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Solution for 2=9+u equation: 



2=9+u

We move all terms to the left:

2-(9+u)=0

We add all the numbers together, and all the variables

-(u+9)+2=0

We get rid of parentheses

-u-9+2=0

We add all the numbers together, and all the variables

-1u-7=0

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

-u=7

u=7/-1

u=-7

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