4/21=16/x

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Solution for 4/21=16/x equation: 


D( x )

x = 0

x = 0

x = 0

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

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

4/21-(16/x) = 0

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

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

x^-1 = 1/84

-1 < 0

1/(x^1) = 1/84 // * x^1

1 = 1/84*x^1 // : 1/84

84 = x^1

x = 84

x = 84

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