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x in (-oo:+oo)
(8*x^3)/2 = 1000 // - 1000
(8*x^3)/2-1000 = 0
4*x^3 = 1000 // : 4
x^3 = 250
x^3 = 250 // ^ 1/3
x = 5*2^(1/3)
x = 5*2^(1/3)
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