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D( x )

x = 0

x = 0

x = 0

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

5-(2/x) = 12 / - 12

5-(2/x)-12 = 0

5-2*x^-1-12 = 0

-2*x^-1 = 7 / : -2

x^-1 = -7/2

-1 < 0

1/(x^1) = -7/2 / * x^1

1 = -7/2*x^1 / : -7/2

-2/7 = x^1

x = -2/7

x = -2/7

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