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