20/z=4

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Solution for 20/z=4 equation: 


D( z )

z = 0

z = 0

z = 0

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

20/z = 4 // - 4

20/z-4 = 0

20*z^-1 = 4 // : 20

z^-1 = 1/5

-1 < 0

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

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

5 = z^1

z = 5

z = 5

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