16/21=4/x

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Solution for 16/21=4/x equation: 


D( x )

x = 0

x = 0

x = 0

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

16/21 = 4/x // - 4/x

16/21-(4/x) = 0

16/21-4*x^-1 = 0

-4*x^-1 = -16/21 // : -4

x^-1 = 4/21

-1 < 0

1/(x^1) = 4/21 // * x^1

1 = 4/21*x^1 // : 4/21

21/4 = x^1

x = 21/4

x = 21/4

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