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D( x )

x = 0

x = 0

x = 0

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

7 = 14/x / - 14/x

7-(14/x) = 0

7-14*x^-1 = 0

-14*x^-1 = -7 / : -14

x^-1 = 1/2

-1 < 0

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

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

2 = x^1

x = 2

x = 2

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