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D( z )
z+8 = 0
z+8 = 0
z+8 = 0
z+8 = 0 // - 8
z = -8
z in (-oo:-8) U (-8:+oo)
16/(z+8) = -z // + z
16/(z+8)+z = 0
16/(z+8)+(z*(z+8))/(z+8) = 0
z*(z+8)+16 = 0
z^2+8*z+16 = 0
z^2+8*z+16 = 0
z^2+8*z+16 = 0
DELTA = 8^2-(1*4*16)
DELTA = 0
z = -8/(1*2)
z = -4 or z = -4
(z+4)^2 = 0
((z+4)^2)/(z+8) = 0
((z+4)^2)/(z+8) = 0 // * z+8
(z+4)^2 = 0
z+4 = 0 // - 4
z = -4
z in { -4, -4 }
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