12/21=18/x

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Solution for 12/21=18/x equation: 


D( x )

x = 0

x = 0

x = 0

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

12/21 = 18/x // - 18/x

12/21-(18/x) = 0

12/21-18*x^-1 = 0

-18*x^-1 = -4/7 // : -18

x^-1 = 2/63

-1 < 0

1/(x^1) = 2/63 // * x^1

1 = 2/63*x^1 // : 2/63

63/2 = x^1

x = 63/2

x = 63/2

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