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D( x )

x = 0

x = 0

x = 0

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

4/8 = 5/x / - 5/x

4/8-(5/x) = 0

4/8-5*x^-1 = 0

-5*x^-1 = -1/2 / : -5

x^-1 = 1/10

-1 < 0

1/(x^1) = 1/10 / * x^1

1 = 1/10*x^1 / : 1/10

10 = x^1

x = 10

x = 10

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