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D( x )
3*x^3 = 0
3*x^3 = 0
3*x^3 = 0
3*x^3 = 0 // : 3
x^3 = 0
x = 0
x in (-oo:0) U (0:+oo)
(5*x^2-(4*x))/(3*x^3) = 0
(5*x^2-4*x)/(3*x^3) = 0
5*x^2-4*x = 0
x*(5*x-4) = 0
5*x-4 = 0 // + 4
5*x = 4 // : 5
x = 4/5
x*(x-4/5) = 0
(x*(x-4/5))/(3*x^3) = 0
( x-4/5 )
x-4/5 = 0 // + 4/5
x = 4/5
( x )
x = 0
x in { 0}
x = 4/5
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