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D( i )
12-(15*i) = 0
12-(15*i) = 0
12-(15*i) = 0
12-15*i = 0
12-15*i = 0 // - 12
-15*i = -12 // : -15
i = -12/(-15)
i = 4/5
i in (-oo:4/5) U (4/5:+oo)
(9-(13*i))/(12-(15*i)) = 0
(9-13*i)/(12-15*i) = 0
9-13*i = 0 // - 9
-13*i = -9 // : -13
i = -9/(-13)
i = 9/13
i = 9/13
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