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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(3*x^3-(2*x^2))/x = 0
(3*x^3-2*x^2)/x = 0
3*x^3-2*x^2 = 0
x^2*(3*x-2) = 0
3*x-2 = 0 // + 2
3*x = 2 // : 3
x = 2/3
x^2*(x-2/3) = 0
(x^2*(x-2/3))/x = 0
( x-2/3 )
x-2/3 = 0 // + 2/3
x = 2/3
( x^2 )
1*x^2 = 0 // : 1
x^2 = 0
x = 0
x in { 0}
x = 2/3
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