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D( z )
z = 0
z = 0
z = 0
z in (-oo:0) U (0:+oo)
15/z = 1 // - 1
15/z-1 = 0
15*z^-1 = 1 // : 15
z^-1 = 1/15
-1 < 0
1/(z^1) = 1/15 // * z^1
1 = 1/15*z^1 // : 1/15
15 = z^1
z = 15
z = 15
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