4/5=5/x

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Solution for 4/5=5/x equation: 


D( x )

x = 0

x = 0

x = 0

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

4/5 = 5/x // - 5/x

4/5-(5/x) = 0

4/5-5*x^-1 = 0

-5*x^-1 = -4/5 // : -5

x^-1 = 4/25

-1 < 0

1/(x^1) = 4/25 // * x^1

1 = 4/25*x^1 // : 4/25

25/4 = x^1

x = 25/4

x = 25/4

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