-9=8+u

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Solution for -9=8+u equation: 



-9=8+u

We move all terms to the left:

-9-(8+u)=0

We add all the numbers together, and all the variables

-(u+8)-9=0

We get rid of parentheses

-u-8-9=0

We add all the numbers together, and all the variables

-1u-17=0

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

-u=17

u=17/-1

u=-17

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