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D( z )
z^2 = 0
z^2 = 0
z^2 = 0
1*z^2 = 0 // : 1
z^2 = 0
z = 0
z in (-oo:0) U (0:+oo)
(35/(z^2))*((4*z^3)/5) = 0
28*z = 0 // : 28
z = 0
z in { 0}
z belongs to the empty set
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