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12/u+12=15

We move all terms to the left:

12/u+12-(15)=0

Domain of the equation: u!=0We add all the numbers together, and all the variables

u∈R

12/u-3=0

We multiply all the terms by the denominator

-3*u+12=0

We add all the numbers together, and all the variables

-3u+12=0

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

-3u=-12

u=-12/-3

u=+4

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