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x in (-oo:+oo)
100 = x^(2/3) // - x^(2/3)
100-x^(2/3) = 0
-1*x^(2/3) = -100 // : -1
x^(2/3) = 100
( 100 < 0 i 2/3 in (0:1) ) => x należy do O
x belongs to the empty set
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