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D( i )
5*i+7 = 0
5*i+7 = 0
5*i+7 = 0
5*i+7 = 0 // - 7
5*i = -7 // : 5
i = -7/5
i in (-oo:-7/5) U (-7/5:+oo)
(6-(3*i))/(5*i+7) = 0
(6-3*i)/(5*i+7) = 0
6-3*i = 0 // - 6
-3*i = -6 // : -3
i = -6/(-3)
i = 2
i = 2
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