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D( z )
9*z = 0
4*z-3 = 0
9*z = 0
9*z = 0
9*z = 0 // : 9
z = 0
4*z-3 = 0
4*z-3 = 0
4*z-3 = 0 // + 3
4*z = 3 // : 4
z = 3/4
z in (-oo:0) U (0:3/4) U (3/4:+oo)
7/(4*z-3) = 4/(9*z) // - 4/(9*z)
7/(4*z-3)-(4/(9*z)) = 0
7/(4*z-3)+(-4/9)*z^-1 = 0
7/(4*z-3)-4/(9*z) = 0
(7*9*z)/(9*z*(4*z-3))+(-4*(4*z-3))/(9*z*(4*z-3)) = 0
7*9*z-4*(4*z-3) = 0
47*z+12 = 0
(47*z+12)/(9*z*(4*z-3)) = 0
(47*z+12)/(9*z*(4*z-3)) = 0 // * 9*z*(4*z-3)
47*z+12 = 0
47*z+12 = 0 // - 12
47*z = -12 // : 47
z = -12/47
z = -12/47
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