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