9/21=12/x

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Solution for 9/21=12/x equation: 


D( x )

x = 0

x = 0

x = 0

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

9/21 = 12/x // - 12/x

9/21-(12/x) = 0

9/21-12*x^-1 = 0

-12*x^-1 = -3/7 // : -12

x^-1 = 1/28

-1 < 0

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

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

28 = x^1

x = 28

x = 28

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