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D( z )
z = 0
z = 0
z = 0
z in (-oo:0) U (0:+oo)
z/6-(6/z) = 0
z/6-6*z^-1 = 0
1/6*z^1-6*z^-1 = 0
(1/6*z^2-6*z^0)/(z^1) = 0 // * z^2
z^1*(1/6*z^2-6*z^0) = 0
z^1
(1/6)*z^2-6 = 0
(1/6)*z^2-6 = 0
DELTA = 0^2-(-6*4*(1/6))
DELTA = 4
DELTA > 0
z = (4^(1/2)+0)/(2*(1/6)) or z = (0-4^(1/2))/(2*(1/6))
z = 6 or z = -6
z in { -6, 6}
z in { -6, 6 }
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