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D( i )
2-(5*i) = 0
2-(5*i) = 0
2-(5*i) = 0
2-5*i = 0
2-5*i = 0 // - 2
-5*i = -2 // : -5
i = -2/(-5)
i = 2/5
i in (-oo:2/5) U (2/5:+oo)
(i+1)/(2-(5*i)) = 0
(i+1)/(2-5*i) = 0
i+1 = 0 // - 1
i = -1
i = -1
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