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D( x )
3*x = 0
3*x = 0
3*x = 0
3*x = 0 // : 3
x = 0
x in (-oo:0) U (0:+oo)
(6*x^3-(3*x^2)+5*x)/(3*x) = 0
(6*x^3-3*x^2+5*x)/(3*x) = 0
6*x^3-3*x^2+5*x = 0
x*(6*x^2-3*x+5) = 0
6*x^2-3*x+5 = 0
DELTA = (-3)^2-(4*5*6)
DELTA = -111
DELTA < 0
x = 0
x/(3*x) = 0
x = 0
x in { 0}
x belongs to the empty set
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