15/4=3/z

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Solution for 15/4=3/z equation: 


D( z )

z = 0

z = 0

z = 0

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

15/4 = 3/z // - 3/z

15/4-(3/z) = 0

15/4-3*z^-1 = 0

-3*z^-1 = -15/4 // : -3

z^-1 = 5/4

-1 < 0

1/(z^1) = 5/4 // * z^1

1 = 5/4*z^1 // : 5/4

4/5 = z^1

z = 4/5

z = 4/5

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