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i in (-oo:+oo)
i*((4-(49*i))/(-7)) = 0
i*((4-49*i)/(-7)) = 0
(i*(4-49*i))/(-7) = 0
( 4-49*i )
4-49*i = 0 // - 4
-49*i = -4 // : -49
i = -4/(-49)
i = 4/49
( i )
i = 0
i in { 4/49, 0 }
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