15/z=5

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Solution for 15/z=5 equation: 


D( z )

z = 0

z = 0

z = 0

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

15/z = 5 // - 5

15/z-5 = 0

15*z^-1 = 5 // : 15

z^-1 = 1/3

-1 < 0

1/(z^1) = 1/3 // * z^1

1 = 1/3*z^1 // : 1/3

3 = z^1

z = 3

z = 3

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