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D( z )
z = 0
z = 0
z = 0
z in (-oo:0) U (0:+oo)
6/z = 45 // - 45
6/z-45 = 0
6*z^-1 = 45 // : 6
z^-1 = 15/2
-1 < 0
1/(z^1) = 15/2 // * z^1
1 = 15/2*z^1 // : 15/2
2/15 = z^1
z = 2/15
z = 2/15
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