4/1.4=9/x

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Solution for 4/1.4=9/x equation: 


D( x )

x = 0

x = 0

x = 0

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

4/1.4 = 9/x // - 9/x

4/1.4-(9/x) = 0

4/1.4-9*x^-1 = 0

-9*x^-1 = -2.85714286 // : -9

x^-1 = 0.31746032

-1 < 0

1/(x^1) = 0.31746032 // * x^1

1 = 0.31746032*x^1 // : 0.31746032

3.14999997 = x^1

x = 3.14999997

x = 3.14999997

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