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D( X )
3*X <= 0
3/X <= 0
X = 0
3*X <= 0
3*X <= 0
3*X+0 <= 0 // - 0
3*X <= 0 // : 3
X <= 0/3
X <= 0
3/X <= 0
3/X <= 0
3*X^-1 <= 0
3*X^-1 <= 0 // : 3
X^-1 <= 0/3
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)
ln(3*X)-ln(3/X) = 0
ln(1*3*X)-ln(3/X) = 0
ln((1*3*X)/(3/X)) = 0
ln((3*X)/(3/X)) = 0
ln((3*X)/(3/X)) = ln(e^0)
(3*X)/(3/X) = e^0
(3*X)/(3/X)-e^0 = 0
1*X^2 = 1 // : 1
X^2 = 1
X^2 = 1 // ^ 1/2
abs(X) = 1
X = 1 or X = -1
X in { -1}
X = 1
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