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D( z )
z = 0
z = 0
z = 0
z in (-oo:0) U (0:+oo)
60/z = 9/100 // - 9/100
60/z-(9/100) = 0
60/z-9/100 = 0
60*z^-1 = 9/100 // : 60
z^-1 = 3/2000
-1 < 0
1/(z^1) = 3/2000 // * z^1
1 = 3/2000*z^1 // : 3/2000
2000/3 = z^1
z = 2000/3
z = 2000/3
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