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x in (-oo:+oo)
(x^3)/4 >= 15 // - 15
(x^3)/4-15 >= 0
1/4*x^3 >= 15
1/4*x^3 >= 15 // : 1/4
x^3 >= 15/1/4
x^3 >= 60
x^3 >= 60 // ^ 1/3
x >= 60^(1/3)
x in <60^(1/3):+oo)
x in <60^(1/3):+oo)
<60^(1/3):+oo)
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