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https://prnt.sc/lwsi19

 Dec 19, 2018
 #1
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+1

this is the question.

 

 Dec 19, 2018
 #2
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+1

Mathematica 11 Home edition gives the following solutions, but NO explanation as to the method they used.

Sorry about that:

x = 0, y = -0.5, z = 0.0497871, w = -2
x = 0, y = -0.5, z = 0.0497871, w = 2

 Dec 19, 2018

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