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D( z )
z = 0
z = 0
z = 0
z in (-oo:0) U (0:+oo)
118/13 = 59/z // - 59/z
118/13-(59/z) = 0
118/13-59*z^-1 = 0
-59*z^-1 = -118/13 // : -59
z^-1 = 2/13
-1 < 0
1/(z^1) = 2/13 // * z^1
1 = 2/13*z^1 // : 2/13
13/2 = z^1
z = 13/2
z = 13/2
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