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x in (-oo:+oo)
(x^3)/2 = 512 // - 512
(x^3)/2-512 = 0
1/2*x^3 = 512 // : 1/2
x^3 = 1024
x^3 = 1024 // ^ 1/3
x = 8*2^(1/3)
x = 8*2^(1/3)
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