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X in (-oo:+oo)
X^(2/3) = -2 // + 2
X^(2/3)+2 = 0
1*X^(2/3) = -2 // : 1
X^(2/3) = -2
( -2 < 0 i 2/3 in (0:1) ) => X naleu017Cy do O
X belongs to the empty set
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