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x in (-oo:+oo)
(-2/3)*x^(1/5) = -2 // + 2
(-2/3)*x^(1/5)+2 = 0
-2/3*x^(1/5) = -2 // : -2/3
x^(1/5) = 3
( 3 < 0 i 1/5 in (0:1) ) => x należy do O
x belongs to the empty set
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