9=10u-u

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Solution for 9=10u-u equation: 



9=10u-u

We move all terms to the left:

9-(10u-u)=0

We add all the numbers together, and all the variables

-(+9u)+9=0

We get rid of parentheses

-9u+9=0

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

-9u=-9

u=-9/-9

u=1

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