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D( z )
z = 0
z = 0
z = 0
z in (-oo:0) U (0:+oo)
82 = (8*12)/z // - (8*12)/z
82-((8*12)/z) = 0
82-96*z^-1 = 0
-96*z^-1 = -82 // : -96
z^-1 = 41/48
-1 < 0
1/(z^1) = 41/48 // * z^1
1 = 41/48*z^1 // : 41/48
48/41 = z^1
z = 48/41
z = 48/41
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