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i in (-oo:+oo)
i*((3-(6*i))/2) = 0
i*((3-6*i)/2) = 0
(i*(3-6*i))/2 = 0
( 3-6*i )
3-6*i = 0 // - 3
-6*i = -3 // : -6
i = -3/(-6)
i = 1/2
( i )
i = 0
i in { 1/2, 0 }
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