60/z=z

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Solution for 60/z=z equation: 


D( z )

z = 0

z = 0

z = 0

z in (-oo:0) U (0:+oo)

60/z = z // - z

60/z-z = 0

60*z^-1-1*z^1 = 0

(60*z^0-1*z^2)/(z^1) = 0 // * z^2

z^1*(60*z^0-1*z^2) = 0

z^1

60-z^2 = 0

60-z^2 = 0

DELTA = 0^2-(-1*4*60)

DELTA = 240

DELTA > 0

z = (240^(1/2)+0)/(-1*2) or z = (0-240^(1/2))/(-1*2)

z = -2*15^(1/2) or z = 2*15^(1/2)

z in { -2*15^(1/2), 2*15^(1/2)} 

z in { -2*15^(1/2), 2*15^(1/2) }

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