3/z=7/21

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Solution for 3/z=7/21 equation: 


D( z )

z = 0

z = 0

z = 0

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

3/z = 7/21 // - 7/21

3/z-(7/21) = 0

3/z-1/3 = 0

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

z^-1 = 1/9

-1 < 0

1/(z^1) = 1/9 // * z^1

1 = 1/9*z^1 // : 1/9

9 = z^1

z = 9

z = 9

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