4/5=20/x

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Solution for 4/5=20/x equation: 


D( x )

x = 0

x = 0

x = 0

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

4/5 = 20/x // - 20/x

4/5-(20/x) = 0

4/5-20*x^-1 = 0

-20*x^-1 = -4/5 // : -20

x^-1 = 1/25

-1 < 0

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

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

25 = x^1

x = 25

x = 25

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