9u-27=12u

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Solution for 9u-27=12u equation: 



9u-27=12u

We move all terms to the left:

9u-27-(12u)=0

We add all the numbers together, and all the variables

-3u-27=0

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

-3u=27

u=27/-3

u=-9

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