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

-(-1u+8)+9=0

We get rid of parentheses

1u-8+9=0

We add all the numbers together, and all the variables

u+1=0

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

u=-1

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