(3/x)-(1/7)

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Solution for (3/x)-(1/7) equation: 


D( x )

x = 0

x = 0

x = 0

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

3/x-(1/7) = 0

3/x-1/7 = 0

3*x^-1 = 1/7 // : 3

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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