12/42=8/x

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Solution for 12/42=8/x equation: 


D( x )

x = 0

x = 0

x = 0

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

12/42 = 8/x // - 8/x

12/42-(8/x) = 0

12/42-8*x^-1 = 0

-8*x^-1 = -2/7 // : -8

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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