4-(4/z)=7

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Solution for 4-(4/z)=7 equation: 


D( z )

z = 0

z = 0

z = 0

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

4-(4/z) = 7 // - 7

4-(4/z)-7 = 0

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

-4*z^-1 = 3 // : -4

z^-1 = -3/4

-1 < 0

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

1 = -3/4*z^1 // : -3/4

-4/3 = z^1

z = -4/3

z = -4/3

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