4/13=20/x

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Solution for 4/13=20/x equation: 


D( x )

x = 0

x = 0

x = 0

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

4/13 = 20/x // - 20/x

4/13-(20/x) = 0

4/13-20*x^-1 = 0

-20*x^-1 = -4/13 // : -20

x^-1 = 1/65

-1 < 0

1/(x^1) = 1/65 // * x^1

1 = 1/65*x^1 // : 1/65

65 = x^1

x = 65

x = 65

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