-1=8-9u

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Solution for -1=8-9u equation: 



-1=8-9u

We move all terms to the left:

-1-(8-9u)=0

We add all the numbers together, and all the variables

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

We get rid of parentheses

9u-8-1=0

We add all the numbers together, and all the variables

9u-9=0

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

9u=9

u=9/9

u=1

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