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D( z )
z = 0
z = 0
z = 0
z in (-oo:0) U (0:+oo)
75 = 10/z // - 10/z
75-(10/z) = 0
75-10*z^-1 = 0
-10*z^-1 = -75 // : -10
z^-1 = 15/2
-1 < 0
1/(z^1) = 15/2 // * z^1
1 = 15/2*z^1 // : 15/2
2/15 = z^1
z = 2/15
z = 2/15
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