Why Short the 4kΩ Resistor in Source Transformation?

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Mdhiggenz
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Homework Statement


I am a bit confused on why they can just randomly short the 4kΩ resistor, as you can see from the first pic to the second pic.
29nv52f.png


2jbdhy.png


THanks


Homework Equations





The Attempt at a Solution

 
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They didn't just short the 4K resistor. The 5 ma current source, the 16K resistor and the 4 k resistor was made into a norton (or is it thevinin) equivalent.
 
It's Thevinin, I just checked.