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D( x )
x = 0
11/x <= 0
x = 0
x = 0
11/x <= 0
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 (0:+oo)
4*ln(11/x) = 0
4*ln(11/x) = 0 // : 4
ln(11/x) = 0
ln(11/x) = ln(e^0)
11/x = e^0
11/x-e^0 = 0
11*x^-1 = 1 // : 11
x^-1 = 1/11
-1 < 0
1/(x^1) = 1/11 // * x^1
1 = 1/11*x^1 // : 1/11
11 = x^1
x = 11
x = 11
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