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