-u+9=2u

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Solution for -u+9=2u equation: 



-u+9=2u

We move all terms to the left:

-u+9-(2u)=0

We add all the numbers together, and all the variables

-3u+9=0

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

-3u=-9

u=-9/-3

u=+3

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