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D( z )
z = 0
z = 0
z = 0
z in (-oo:0) U (0:+oo)
8/z+3 = 7/z-9 // - 7/z-9
8/z-(7/z)+3+9 = 0
8/z-7*z^-1+3+9 = 0
1*z^-1 = -12 // : 1
z^-1 = -12
-1 < 0
1/(z^1) = -12 // * z^1
1 = -12*z^1 // : -12
-1/12 = z^1
z = -1/12
z = -1/12
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