4/z=2/10

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Solution for 4/z=2/10 equation: 


D( z )

z = 0

z = 0

z = 0

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

4/z = 2/10 // - 2/10

4/z-(2/10) = 0

4/z-1/5 = 0

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

z^-1 = 1/20

-1 < 0

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

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

20 = z^1

z = 20

z = 20

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