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