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x in (-oo:+oo)
54 = 27*x^(1/3) // - 27*x^(1/3)
54-(27*x^(1/3)) = 0
54-27*x^(1/3) = 0
-27*x^(1/3) = -54 // : -27
x^(1/3) = 2
( 2 < 0 i 1/3 in (0:1) ) => x należy do O
x belongs to the empty set
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