8.9/z=-21

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Solution for 8.9/z=-21 equation: 


D( z )

z = 0

z = 0

z = 0

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

8.9/z = -21 // + 21

8.9/z+21 = 0

8.9*z^-1 = -21 // : 8.9

z^-1 = -2.35955056

-1 < 0

1/(z^1) = -2.35955056 // * z^1

1 = -2.35955056*z^1 // : -2.35955056

-0.42380952 = z^1

z = -0.42380952

z = -0.42380952

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