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