(7/28)=(3/x)

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Solution for (7/28)=(3/x) equation: 


D( x )

x = 0

x = 0

x = 0

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

7/28 = 3/x // - 3/x

7/28-(3/x) = 0

7/28-3*x^-1 = 0

-3*x^-1 = -1/4 // : -3

x^-1 = 1/12

-1 < 0

1/(x^1) = 1/12 // * x^1

1 = 1/12*x^1 // : 1/12

12 = x^1

x = 12

x = 12

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