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D( z )
20*z^2 = 0
20*z^2 = 0
20*z^2 = 0
20*z^2 = 0 // : 20
z^2 = 0
z = 0
z in (-oo:0) U (0:+oo)
(18*z^8)/(20*z^2) = 0
9/10*z^6 = 0 // : 9/10
z^6 = 0
z = 0
z in { 0}
z belongs to the empty set
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