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D( x )

x = 0

x = 0

x = 0

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

4/x = 0.66 / - 0.66

4/x-0.66 = 0

4*x^-1 = 0.66 / : 4

x^-1 = 0.165

-1 < 0

1/(x^1) = 0.165 / * x^1

1 = 0.165*x^1 / : 0.165

6.06060606 = x^1

x = 6.06060606

x = 6.06060606

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