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