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x in (-oo:+oo)
x-((1/6)*x^3) = 0
(-1/6)*x^3+x = 0
x-1/6*x^3 = 0
x*(1-1/6*x^2) = 0
-1/6*x^2 = -1 // : -1/6
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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