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i in (-oo:+oo)
i*((-(3*i)-2)/7) = 0
i*((-3*i-2)/7) = 0
(i*(-3*i-2))/7 = 0
( -3*i-2 )
-3*i-2 = 0 // + 2
-3*i = 2 // : -3
i = 2/(-3)
i = -2/3
( i )
i = 0
i in { -2/3, 0 }
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