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