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