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D( x )
3*x^(1/3) = 0
3*x^(1/3) = 0
3*x^(1/3) = 0
3*x^(1/3) = 0 // : 3
x^(1/3) = 0
x = 0
x in (-oo:0) U (0:+oo)
(5*(x-2))/(3*x^(1/3)) = 0
( 5 )
5 = 0
x belongs to the empty set
( x-2 )
x-2 = 0 // + 2
x = 2
x = 2
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