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