3/9=7/x

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Solution for 3/9=7/x equation: 


D( x )

x = 0

x = 0

x = 0

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

3/9 = 7/x // - 7/x

3/9-(7/x) = 0

3/9-7*x^-1 = 0

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

x^-1 = 1/21

-1 < 0

1/(x^1) = 1/21 // * x^1

1 = 1/21*x^1 // : 1/21

21 = x^1

x = 21

x = 21

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