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x in (-oo:+oo)
(1/4)*x^4-((1/4)*x^6) = 0
(-1/4)*x^6+(1/4)*x^4 = 0
1/4*x^4-1/4*x^6 = 0
1/4*x^4*(1-x^2) = 0
-1*x^2 = -1 // : -1
x^2 = 1
x^2 = 1 // ^ 1/2
abs(x) = 1
x = 1 or x = -1
(x^4)/4 = 0
1/4*x^4 = 0 // : 1/4
x^4 = 0
x = 0
x in { 1, -1, 0 }
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