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D( x )
((x^2)/5)*z = 0
((x^2)/5)*z = 0
((x^2)/5)*z = 0
1/5*x^2*z = 0 // : 1/5*z
x^2 = 0
x = 0
x in (-oo:0) U (0:+oo)
(((x^2)/5)*z)^-2 = 0
25*x^-4*z^-2 = 0 // : 25*z^-2
x^-4 = 0
x należy do O
x belongs to the empty set
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