15/21=13,36/x

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Solution for 15/21=13,36/x equation: 


D( x )

x = 0

x = 0

x = 0

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

15/21 = 13.36/x // - 13.36/x

15/21-(13.36/x) = 0

15/21-13.36*x^-1 = 0

-13.36*x^-1 = -5/7 // : -13.36

x^-1 = 0.0534645

-1 < 0

1/(x^1) = 0.0534645 // * x^1

1 = 0.0534645*x^1 // : 0.0534645

18.70399985 = x^1

x = 18.70399985

x = 18.70399985

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