14/z=9-z

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Solution for 14/z=9-z equation: 


D( z )

z = 0

z = 0

z = 0

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

14/z = 9-z // - 9-z

z+14/z-9 = 0

1*z^1+14*z^-1-9*z^0 = 0

(1*z^2-9*z^1+14*z^0)/(z^1) = 0 // * z^2

z^1*(1*z^2-9*z^1+14*z^0) = 0

z^1

z^2-9*z+14 = 0

z^2-9*z+14 = 0

DELTA = (-9)^2-(1*4*14)

DELTA = 25

DELTA > 0

z = (25^(1/2)+9)/(1*2) or z = (9-25^(1/2))/(1*2)

z = 7 or z = 2

z in { 2, 7} 

z in { 2, 7 }

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