7/8.4=4/x

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Solution for 7/8.4=4/x equation: 


D( x )

x = 0

x = 0

x = 0

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

7/8.4 = 4/x // - 4/x

7/8.4-(4/x) = 0

7/8.4-4*x^-1 = 0

-4*x^-1 = -0.83333333 // : -4

x^-1 = 0.20833333

-1 < 0

1/(x^1) = 0.20833333 // * x^1

1 = 0.20833333*x^1 // : 0.20833333

4.80000008 = x^1

x = 4.80000008

x = 4.80000008

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