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i in (-oo:+oo)
i*((6-(7*i))/3) = 0
i*((6-7*i)/3) = 0
(i*(6-7*i))/3 = 0
( 6-7*i )
6-7*i = 0 // - 6
-7*i = -6 // : -7
i = -6/(-7)
i = 6/7
( i )
i = 0
i in { 6/7, 0 }
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