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x in (-oo:+oo)
x^(1/3) = -4 // + 4
x^(1/3)+4 = 0
1*x^(1/3) = -4 // : 1
x^(1/3) = -4
( -4 < 0 i 1/3 in (0:1) ) => x naleu017Cy do O
x belongs to the empty set
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