21/19.9=9/x

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Solution for 21/19.9=9/x equation: 


D( x )

x = 0

x = 0

x = 0

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

21/19.9 = 9/x // - 9/x

21/19.9-(9/x) = 0

21/19.9-9*x^-1 = 0

-9*x^-1 = -1.05527638 // : -9

x^-1 = 0.11725293

-1 < 0

1/(x^1) = 0.11725293 // * x^1

1 = 0.11725293*x^1 // : 0.11725293

8.52857152 = x^1

x = 8.52857152

x = 8.52857152

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