2-8/x-20

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Solution for 2-8/x-20 equation: 


D( x )

x = 0

x = 0

x = 0

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

2-(8/x)-2 > 0

2-8*x^-1-2 > 0

-8*x^-1 > 0

-8*x^-1 > 0 // * -1

8*x^-1 < 0

8*x^-1 < 0 // : 8

x^-1 < 0/8

x^-1 < 0

1/(x^1) < 0

x <> 0

1/(x^1) < 0 // * x^2

(x^2)/(x^1) < 0

x^1 < 0

x < 0

x in (-oo:0)

x in (-oo:0)

(-oo:0)

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