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i in (-oo:+oo)
i*((1-(1*i))/7) = 0
i*((1-i)/7) = 0
(i*(1-i))/7 = 0
( 1-i )
1-i = 0 // - 1
-i = -1 // * -1
i = 1
( i )
i = 0
i in { 1, 0 }
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