12/21=28/x

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Solution for 12/21=28/x equation: 


D( x )

x = 0

x = 0

x = 0

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

12/21 = 28/x // - 28/x

12/21-(28/x) = 0

12/21-28*x^-1 = 0

-28*x^-1 = -4/7 // : -28

x^-1 = 1/49

-1 < 0

1/(x^1) = 1/49 // * x^1

1 = 1/49*x^1 // : 1/49

49 = x^1

x = 49

x = 49

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