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D( z )
10*z+5 = 0
10*z+5 = 0
10*z+5 = 0
10*z+5 = 0 // - 5
10*z = -5 // : 10
z = -5/10
z = -1/2
z in (-oo:-1/2) U (-1/2:+oo)
(5*z-4)/(10*z+5) = 0
5*z-4 = 0 // + 4
5*z = 4 // : 5
z = 4/5
z = 4/5
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