(u-9)*9=18

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Solution for (u-9)*9=18 equation: 



(u-9)*9=18

We move all terms to the left:

(u-9)*9-(18)=0

We multiply parentheses

9u-81-18=0

We add all the numbers together, and all the variables

9u-99=0

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

9u=99

u=99/9

u=11

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