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x in (-oo:+oo)
(12/2)*x^3+4 = 0
6*x^3 = -4 // : 6
x^3 = -2/3
x^3 = -2/3 // ^ 1/3
x = -(2/3)^(1/3)
x = -(2/3)^(1/3)
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