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D( i )
2*i+1 = 0
2*i+1 = 0
2*i+1 = 0
2*i+1 = 0 // - 1
2*i = -1 // : 2
i = -1/2
i in (-oo:-1/2) U (-1/2:+oo)
(1-(10*i))/(2*i+1) = 0
(1-10*i)/(2*i+1) = 0
1-10*i = 0 // - 1
-10*i = -1 // : -10
i = -1/(-10)
i = 1/10
i = 1/10
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