-9u=9-8u

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



-9u=9-8u

We move all terms to the left:

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

We add all the numbers together, and all the variables

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

We get rid of parentheses

-9u+8u-9=0

We add all the numbers together, and all the variables

-1u-9=0

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

-u=9

u=9/-1

u=-9

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