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x in (-oo:+oo)
x^(2/3) = -36 // + 36
x^(2/3)+36 = 0
1*x^(2/3) = -36 // : 1
x^(2/3) = -36
( -36 < 0 i 2/3 in (0:1) ) => x należy do O
x belongs to the empty set
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