7z/z^2-25

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Solution for 7z/z^2-25 equation: 


D( z )

z^2 = 0

z^2 = 0

z^2 = 0

1*z^2 = 0 // : 1

z^2 = 0

z = 0

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

(7*z)/(z^2)-25 = 0

7*z^-1 = 25 // : 7

z^-1 = 25/7

-1 < 0

1/(z^1) = 25/7 // * z^1

1 = 25/7*z^1 // : 25/7

7/25 = z^1

z = 7/25

z = 7/25

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