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((X^3)/2)*x-(3*x^3) = 0
((X^3)/2)*x-3*x^3 = 0
1/2*X^3*x-3*x^3 = 0
x*(1/2*X^3-3*x^2) = 0
-3*x^2 = -(1/2*X^3) // : -3
x^2 = 1/6*X^3
x^2 = 1/6*X^3 // ^ 1/2
abs(x) = (1/6)^(1/2)*X^(3/2)
x = (1/6)^(1/2)*X^(3/2) or x = -((1/6)^(1/2)*X^(3/2))
x = 0
x = 0
x in { (1/6)^(1/2)*X^(3/2), -((1/6)^(1/2)*X^(3/2)), 0 }
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