7/z+1-5/z-1

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Solution for 7/z+1-5/z-1 equation: 


D( z )

z = 0

z = 0

z = 0

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

7/z-(5/z)-1+1 = 0

7/z-5*z^-1-1+1 = 0

2*z^-1 = 0 // : 2

z^-1 = 0

z naleu017Cy do O

z belongs to the empty set

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