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D( i )
2*i+2 = 0
2*i+2 = 0
2*i+2 = 0
2*i+2 = 0 // - 2
2*i = -2 // : 2
i = -2/2
i = -1
i in (-oo:-1) U (-1:+oo)
(3*i+1)/(2*i+2) = 0
3*i+1 = 0 // - 1
3*i = -1 // : 3
i = -1/3
i = -1/3
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