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D( z )
z = 0
z = 0
z = 0
z in (-oo:0) U (0:+oo)
4/8 = 36/z // - 36/z
4/8-(36/z) = 0
4/8-36*z^-1 = 0
-36*z^-1 = -1/2 // : -36
z^-1 = 1/72
-1 < 0
1/(z^1) = 1/72 // * z^1
1 = 1/72*z^1 // : 1/72
72 = z^1
z = 72
z = 72
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