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