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D( X )
11/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 = 0
X = 0
X in (0:+oo)
3*ln(11/X) = 0
3*ln(11/X) = 0 // : 3
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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