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D( z )
z = 0
z = 0
z = 0
z in (-oo:0) U (0:+oo)
2/z-5 = z/50+7 // - z/50+7
2/z-(z/50)-7-5 = 0
2*z^-1-1/50*z^1-12*z^0 = 0
(2*z^0-1/50*z^2-12*z^1)/(z^1) = 0 // * z^2
z^1*(2*z^0-1/50*z^2-12*z^1) = 0
z^1
(-1/50)*z^2-12*z+2 = 0
(-1/50)*z^2-12*z+2 = 0
DELTA = (-12)^2-(2*4*(-1/50))
DELTA = 3604/25
DELTA > 0
z = ((3604/25)^(1/2)+12)/(2*(-1/50)) or z = (12-(3604/25)^(1/2))/(2*(-1/50))
z = -25*((3604/25)^(1/2)+12) or z = -25*(12-(3604/25)^(1/2))
z in { -25*((3604/25)^(1/2)+12), -25*(12-(3604/25)^(1/2))}
z in { -25*((3604/25)^(1/2)+12), -25*(12-(3604/25)^(1/2)) }
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