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