20-22=-4/z

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Solution for 20-22=-4/z equation: 


D( z )

z = 0

z = 0

z = 0

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

20-22 = -4/z // + -4/z

20-(-4/z)-22 = 0

4*z^-1-22+20 = 0

4*z^-1 = 2 // : 4

z^-1 = 1/2

-1 < 0

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

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

2 = z^1

z = 2

z = 2

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