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