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D( z )
z = 0
z = 0
z = 0
z in (-oo:0) U (0:+oo)
(2*z)/z+2 = ((3*z)/2)*z-3 // - ((3*z)/2)*z-3
(2*z)/z-(((3*z)/2)*z)+2+3 = 0
(-3/2)*z^2+(2*z)/z+2+3 = 0
-3/2*z^2 = -7 // : -3/2
z^2 = 14/3
z^2 = 14/3 // ^ 1/2
abs(z) = (14/3)^(1/2)
z = (14/3)^(1/2) or z = -(14/3)^(1/2)
z in { (14/3)^(1/2), -(14/3)^(1/2) }
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