4=-12/u

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Solution for 4=-12/u equation: 



4=-12/u

We move all terms to the left:

4-(-12/u)=0



Domain of the equation: u)!=0

u!=0/1

u!=0

u∈R



We get rid of parentheses

12/u+4=0

We multiply all the terms by the denominator


4*u+12=0

We add all the numbers together, and all the variables

4u+12=0

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

4u=-12

u=-12/4

u=-3

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