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i in (-oo:+oo)
i*((4-(4*i))/2) = 0
i*((4-4*i)/2) = 0
(i*(4-4*i))/2 = 0
( 4-4*i )
4-4*i = 0 // - 4
-4*i = -4 // : -4
i = -4/(-4)
i = 1
( i )
i = 0
i in { 1, 0 }
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