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x in (-oo:+oo)
(4*(2*x^2-6))/129 = 0
( 2*x^2-6 )
2*x^2 = 6 // : 2
x^2 = 3
x^2 = 3 // ^ 1/2
abs(x) = 3^(1/2)
x = 3^(1/2) or x = -3^(1/2)
( 4 )
4 = 0
x belongs to the empty set
x in { 3^(1/2), -3^(1/2) }
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