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D( x )

x = 0

x = 0

x = 0

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

3/x-(1/x)-3 = 0

3/x-x^-1-3 = 0

2*x^-1 = 3 / : 2

x^-1 = 3/2

-1 < 0

1/(x^1) = 3/2 / * x^1

1 = 3/2*x^1 / : 3/2

2/3 = x^1

x = 2/3

x = 2/3

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