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x in (-oo:+oo)
98 = -2*x^(1/3) // + -2*x^(1/3)
98-(-2*x^(1/3)) = 0
2*x^(1/3)+98 = 0
2*x^(1/3) = -98 // : 2
x^(1/3) = -49
( -49 < 0 i 1/3 in (0:1) ) => x należy do O
x belongs to the empty set
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