4/z-7/z

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Solution for 4/z-7/z equation: 


D( z )

z = 0

z = 0

z = 0

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

4/z-(7/z) = 0

4/z-7*z^-1 = 0

-3*z^-1 = 0 // : -3

z^-1 = 0

z naleu017Cy do O

z belongs to the empty set

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