4/7=12/x

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Solution for 4/7=12/x equation: 


D( x )

x = 0

x = 0

x = 0

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

4/7 = 12/x // - 12/x

4/7-(12/x) = 0

4/7-12*x^-1 = 0

-12*x^-1 = -4/7 // : -12

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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