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D( i )
6*i+9 = 0
6*i+9 = 0
6*i+9 = 0
6*i+9 = 0 // - 9
6*i = -9 // : 6
i = -9/6
i = -3/2
i in (-oo:-3/2) U (-3/2:+oo)
(-(5*i)-2)/(6*i+9) = 0
(-5*i-2)/(6*i+9) = 0
-5*i-2 = 0 // + 2
-5*i = 2 // : -5
i = 2/(-5)
i = -2/5
i = -2/5
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