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D( x )
3*x <= 0
3*x <= 0
3*x <= 0
3*x+0 <= 0 // - 0
3*x <= 0 // : 3
x <= 0/3
x <= 0
x in (0:+oo)
(((5*x^2)/3)/3)*ln(3*x) = 0
((5*x^2)/3)/3 = 0
5/9*x^2 = 0 // : 5/9
x^2 = 0
x = 0
ln(3*x) = 0
ln(3*x) = ln(e^0)
3*x = e^0
3*x-e^0 = 0
3*x-1 = 0 // + 1
3*x = 1 // : 3
x = 1/3
(((5*x^2)/3)/3)*ln(3*x) = 0 <=> ((5*x^2)/3)/3 = 0 or (((5*x^2)/3)/3)*ln(3*x) = 0 <=> ln(3*x) = 0
x in { 0}
x = 1/3
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