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D( i )
10-(3*i) = 0
10-(3*i) = 0
10-(3*i) = 0
10-3*i = 0
10-3*i = 0 // - 10
-3*i = -10 // : -3
i = -10/(-3)
i = 10/3
i in (-oo:10/3) U (10/3:+oo)
2/(10-(3*i)) = 0
2/(10-3*i) = 0
i belongs to the empty set
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