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