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D( z )
z = 0
z = 0
z = 0
z in (-oo:0) U (0:+oo)
(2*z)/z+4 = 3*z-(2*z)-5 // - 3*z-(2*z)-5
2*z-(3*z)+(2*z)/z+4+5 = 0
2*z-3*z+(2*z)/z+4+5 = 0
11-z = 0 // - 11
-z = -11 // * -1
z = 11
z = 11
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