4/7=9/x

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Solution for 4/7=9/x equation: 


D( x )

x = 0

x = 0

x = 0

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

4/7 = 9/x // - 9/x

4/7-(9/x) = 0

4/7-9*x^-1 = 0

-9*x^-1 = -4/7 // : -9

x^-1 = 4/63

-1 < 0

1/(x^1) = 4/63 // * x^1

1 = 4/63*x^1 // : 4/63

63/4 = x^1

x = 63/4

x = 63/4

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