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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)
(2*z)/(z^2)-16 = 0
2*z^-1 = 16 // : 2
z^-1 = 8
-1 < 0
1/(z^1) = 8 // * z^1
1 = 8*z^1 // : 8
1/8 = z^1
z = 1/8
z = 1/8
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