(u-5)*9=90

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Solution for (u-5)*9=90 equation: 



(u-5)*9=90

We move all terms to the left:

(u-5)*9-(90)=0

We multiply parentheses

9u-45-90=0

We add all the numbers together, and all the variables

9u-135=0

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

9u=135

u=135/9

u=15

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