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D( z )
z = 0
z = 0
z = 0
z in (-oo:0) U (0:+oo)
7/8 = 12/z // - 12/z
7/8-(12/z) = 0
7/8-12*z^-1 = 0
-12*z^-1 = -7/8 // : -12
z^-1 = 7/96
-1 < 0
1/(z^1) = 7/96 // * z^1
1 = 7/96*z^1 // : 7/96
96/7 = z^1
z = 96/7
z = 96/7
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