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D( x )
3*x <= 0
x^2 = 0
3*x <= 0
3*x <= 0
3*x+0 <= 0 // - 0
3*x <= 0 // : 3
x <= 0/3
x <= 0
x^2 = 0
x^2 = 0
1*x^2 = 0 // : 1
x^2 = 0
x = 0
x in (0:+oo)
-((ln(3*x)-1)/(x^2)) = 0
-((ln(3*x)-1)/(x^2)) = 0 // * x^2
ln(3*x)-1 = 0
ln(3*x)-1 = 0 // + 1
ln(3*x) = 1
ln(3*x) = ln(e^1)
3*x = e^1
3*x-e^1 = 0
3*x-e = 0 // + e
3*x = e // : 3
x = e/3
x = e/3
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