8=-9+u

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Solution for 8=-9+u equation: 



8=-9+u

We move all terms to the left:

8-(-9+u)=0

We add all the numbers together, and all the variables

-(u-9)+8=0

We get rid of parentheses

-u+9+8=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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