20/25=4/x

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Solution for 20/25=4/x equation: 


D( x )

x = 0

x = 0

x = 0

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

20/25 = 4/x // - 4/x

20/25-(4/x) = 0

20/25-4*x^-1 = 0

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

x^-1 = 1/5

-1 < 0

1/(x^1) = 1/5 // * x^1

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

5 = x^1

x = 5

x = 5

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