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D( z )
z = 0
z = 0
z = 0
z in (-oo:0) U (0:+oo)
238/z = 17 // - 17
238/z-17 = 0
238*z^-1 = 17 // : 238
z^-1 = 1/14
-1 < 0
1/(z^1) = 1/14 // * z^1
1 = 1/14*z^1 // : 1/14
14 = z^1
z = 14
z = 14
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