9-8u=-9u

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Solution for 9-8u=-9u equation: 



9-8u=-9u

We move all terms to the left:

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

We get rid of parentheses

-8u+9u+9=0

We add all the numbers together, and all the variables

u+9=0

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

u=-9

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