21/z=77/33

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Solution for 21/z=77/33 equation: 


D( z )

z = 0

z = 0

z = 0

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

21/z = 77/33 // - 77/33

21/z-(77/33) = 0

21/z-7/3 = 0

21*z^-1 = 7/3 // : 21

z^-1 = 1/9

-1 < 0

1/(z^1) = 1/9 // * z^1

1 = 1/9*z^1 // : 1/9

9 = z^1

z = 9

z = 9

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