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