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D( x )
((-20*y^0*x^-3)/8)*z^-1 = 0
x = 0
((-20*y^0*x^-3)/8)*z^-1 = 0
((-20*y^0*x^-3)/8)*z^-1 = 0
((-20*x^-3)/8)*z^-1 = 0
-5/2*x^-3*z^-1 = 0 // : -5/2*z^-1
x^-3 = 0
x naleu017Cy do O
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(((-20*y^0*x^-3)/8)*z^-1)^-3 = 0
(((-20*x^-3)/8)*z^-1)^-3 = 0
-8/125*x^9*z^3 = 0 // : -8/125*z^3
x^9 = 0
x = 0
x in { 0}
x belongs to the empty set
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