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i in (-oo:+oo)
(1/3-(7*i))*(7*i+1/3) = 0
(1/3-7*i)*(7*i+1/3) = 0
( 1/3-7*i )
1/3-7*i = 0 // - 1/3
-7*i = -1/3 // : -7
i = -1/3/(-7)
i = 1/21
( 7*i+1/3 )
7*i+1/3 = 0 // - 1/3
7*i = -1/3 // : 7
i = -1/3/7
i = -1/21
i in { 1/21, -1/21 }
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