12/u=-3

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Solution for 12/u=-3 equation: 



12/u=-3

We move all terms to the left:

12/u-(-3)=0



Domain of the equation: u!=0

u∈R



We add all the numbers together, and all the variables

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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