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D( x )
8*x^-3*z = 0
x = 0
8*x^-3*z = 0
8*x^-3*z = 0
8*x^-3*z = 0 // : 8*z
x^-3 = 0
x należy do O
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(24*x^4*z^-3)/(8*x^-3*z) = 0
3*x^7*z^-4 = 0 // : 3*z^-4
x^7 = 0
x = 0
x in { 0}
x belongs to the empty set
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