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x in (-oo:+oo)
6*x-((4/3)*x^3) = 0
(-4/3)*x^3+6*x = 0
6*x-4/3*x^3 = 0
2*x*(3-2/3*x^2) = 0
-2/3*x^2 = -3 // : -2/3
x^2 = 9/2
x^2 = 9/2 // ^ 1/2
abs(x) = (9/2)^(1/2)
x = (9/2)^(1/2) or x = -(9/2)^(1/2)
2*x = 0
2*x = 0 // : 2
x = 0
x in { (9/2)^(1/2), -(9/2)^(1/2), 0 }
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