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D( z )
z-3 = 0
z-3 = 0
z-3 = 0
z-3 = 0 // + 3
z = 3
z in (-oo:3) U (3:+oo)
(z^4)/(z-3) = 0
1*z^4 = 0 // : 1
z^4 = 0
z = 0
z = 0
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