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x in (-oo:+oo)
(1/4)*((x^3)/2) < 0
1/8*x^3 < 0
1/8*x^3 < 0 // : 1/8
x^3 < 0/1/8
x^3 < 0
x^3 < 0 // ^ 1/3
x < 0
x in (-oo:0)
x in (-oo:0)
(-oo:0)
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