4/z=21/5

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Solution for 4/z=21/5 equation: 


D( z )

z = 0

z = 0

z = 0

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

4/z = 21/5 // - 21/5

4/z-(21/5) = 0

4/z-21/5 = 0

4*z^-1 = 21/5 // : 4

z^-1 = 21/20

-1 < 0

1/(z^1) = 21/20 // * z^1

1 = 21/20*z^1 // : 21/20

20/21 = z^1

z = 20/21

z = 20/21

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