4/20=1/x

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Solution for 4/20=1/x equation: 


D( x )

x = 0

x = 0

x = 0

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

4/20 = 1/x // - 1/x

4/20-(1/x) = 0

4/20-x^-1 = 0

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

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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