6/20=9/x

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Solution for 6/20=9/x equation: 


D( x )

x = 0

x = 0

x = 0

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

6/20 = 9/x // - 9/x

6/20-(9/x) = 0

6/20-9*x^-1 = 0

-9*x^-1 = -3/10 // : -9

x^-1 = 1/30

-1 < 0

1/(x^1) = 1/30 // * x^1

1 = 1/30*x^1 // : 1/30

30 = x^1

x = 30

x = 30

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