7/9=9/x

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Solution for 7/9=9/x equation: 


D( x )

x = 0

x = 0

x = 0

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

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

7/9-(9/x) = 0

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

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

x^-1 = 7/81

-1 < 0

1/(x^1) = 7/81 // * x^1

1 = 7/81*x^1 // : 7/81

81/7 = x^1

x = 81/7

x = 81/7

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