2/10=5/z

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Solution for 2/10=5/z equation: 


D( z )

z = 0

z = 0

z = 0

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

2/10 = 5/z // - 5/z

2/10-(5/z) = 0

2/10-5*z^-1 = 0

-5*z^-1 = -1/5 // : -5

z^-1 = 1/25

-1 < 0

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

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

25 = z^1

z = 25

z = 25

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