6/7/12/12=4/x

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Solution for 6/7/12/12=4/x equation: 


D( x )

x = 0

x = 0

x = 0

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

((6/7)/12)/12 = 4/x // - 4/x

((6/7)/12)/12-(4/x) = 0

((6/7)/12)/12-4*x^-1 = 0

-4*x^-1 = -1/168 // : -4

x^-1 = 1/672

-1 < 0

1/(x^1) = 1/672 // * x^1

1 = 1/672*x^1 // : 1/672

672 = x^1

x = 672

x = 672

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