4z^-3/20z^-1

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Solution for 4z^-3/20z^-1 equation: 


D( z )

z = 0

z = 0

z = 0

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

((4*z^-3)/20)*z^-1 = 0

1/5*z^-4 = 0 // : 1/5

z^-4 = 0

z należy do O

z belongs to the empty set

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