7=56/z

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Solution for 7=56/z equation: 


D( z )

z = 0

z = 0

z = 0

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

7 = 56/z // - 56/z

7-(56/z) = 0

7-56*z^-1 = 0

-56*z^-1 = -7 // : -56

z^-1 = 1/8

-1 < 0

1/(z^1) = 1/8 // * z^1

1 = 1/8*z^1 // : 1/8

8 = z^1

z = 8

z = 8

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