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x in (-oo:+oo)
(x^3)/2 = 243 // - 243
(x^3)/2-243 = 0
1/2*x^3 = 243 // : 1/2
x^3 = 486
x^3 = 486 // ^ 1/3
x = 3*18^(1/3)
x = 3*18^(1/3)
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