3/7=4/x

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Solution for 3/7=4/x equation: 


D( x )

x = 0

x = 0

x = 0

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

3/7 = 4/x // - 4/x

3/7-(4/x) = 0

3/7-4*x^-1 = 0

-4*x^-1 = -3/7 // : -4

x^-1 = 3/28

-1 < 0

1/(x^1) = 3/28 // * x^1

1 = 3/28*x^1 // : 3/28

28/3 = x^1

x = 28/3

x = 28/3

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