20=8/z

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Solution for 20=8/z equation: 


D( z )

z = 0

z = 0

z = 0

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

20 = 8/z // - 8/z

20-(8/z) = 0

20-8*z^-1 = 0

-8*z^-1 = -20 // : -8

z^-1 = 5/2

-1 < 0

1/(z^1) = 5/2 // * z^1

1 = 5/2*z^1 // : 5/2

2/5 = z^1

z = 2/5

z = 2/5

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