9-9u=-1-7u-8

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Solution for 9-9u=-1-7u-8 equation: 



9-9u=-1-7u-8

We move all terms to the left:

9-9u-(-1-7u-8)=0

We add all the numbers together, and all the variables

-9u-(-7u-9)+9=0

We get rid of parentheses

-9u+7u+9+9=0

We add all the numbers together, and all the variables

-2u+18=0

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

-2u=-18

u=-18/-2

u=+9

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