20-11u=9u

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Solution for 20-11u=9u equation: 



20-11u=9u

We move all terms to the left:

20-11u-(9u)=0

We add all the numbers together, and all the variables

-20u+20=0

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

-20u=-20

u=-20/-20

u=1

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