9=u-9

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Solution for 9=u-9 equation: 



9=u-9

We move all terms to the left:

9-(u-9)=0

We get rid of parentheses

-u+9+9=0

We add all the numbers together, and all the variables

-1u+18=0

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

-u=-18

u=-18/-1

u=+18

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