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D( i )
3-(10*i) = 0
3-(10*i) = 0
3-(10*i) = 0
3-10*i = 0
3-10*i = 0 // - 3
-10*i = -3 // : -10
i = -3/(-10)
i = 3/10
i in (-oo:3/10) U (3/10:+oo)
(10-(3*i))/(3-(10*i)) = 0
(10-3*i)/(3-10*i) = 0
10-3*i = 0 // - 10
-3*i = -10 // : -3
i = -10/(-3)
i = 10/3
i = 10/3
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