9=18-u

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Solution for 9=18-u equation: 



9=18-u

We move all terms to the left:

9-(18-u)=0

We add all the numbers together, and all the variables

-(-1u+18)+9=0

We get rid of parentheses

1u-18+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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