21/z=3

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Solution for 21/z=3 equation: 


D( z )

z = 0

z = 0

z = 0

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

21/z = 3 // - 3

21/z-3 = 0

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

z^-1 = 1/7

-1 < 0

1/(z^1) = 1/7 // * z^1

1 = 1/7*z^1 // : 1/7

7 = z^1

z = 7

z = 7

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