9/5=45/z

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Solution for 9/5=45/z equation: 


D( z )

z = 0

z = 0

z = 0

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

9/5 = 45/z // - 45/z

9/5-(45/z) = 0

9/5-45*z^-1 = 0

-45*z^-1 = -9/5 // : -45

z^-1 = 1/25

-1 < 0

1/(z^1) = 1/25 // * z^1

1 = 1/25*z^1 // : 1/25

25 = z^1

z = 25

z = 25

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