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D( z )
z = 0
z = 0
z = 0
z in (-oo:0) U (0:+oo)
13/6 = 52/z // - 52/z
13/6-(52/z) = 0
13/6-52*z^-1 = 0
-52*z^-1 = -13/6 // : -52
z^-1 = 1/24
-1 < 0
1/(z^1) = 1/24 // * z^1
1 = 1/24*z^1 // : 1/24
24 = z^1
z = 24
z = 24
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