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b in (-oo:+oo)
25 = b^(2/5) // - b^(2/5)
25-b^(2/5) = 0
-1*b^(2/5) = -25 // : -1
b^(2/5) = 25
( 25 < 0 i 2/5 in (0:1) ) => b należy do O
b belongs to the empty set
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