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D( x )
2*x-1 = 0
2*x-1 = 0
2*x-1 = 0
2*x-1 = 0 // + 1
2*x = 1 // : 2
x = 1/2
x in (-oo:1/2) U (1/2:+oo)
(4/3)*X^2*(2*x-1)^(-1/3) = 0
(4/3*X^2)/((2*x-1)^(1/3)) = 0
x belongs to the empty set
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