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D( z )
z+0.5 = 0
z+0.5 = 0
z+0.5 = 0
z+0.5 = 0 // - 0.5
z = -0.5
z in (-oo:-0.5) U (-0.5:+oo)
(6*z+4.8)/(z+0.5) = 0
6*z+4.8 = 0 // - 4.8
6*z = -4.8 // : 6
z = -4.8/6
z = -0.8
z = -0.8
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