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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
11/x <= 0
11*x^-1 <= 0
11*x^-1 <= 0 // : 11
x^-1 <= 0/11
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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