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D( i )
4*i+1 = 0
4*i+1 = 0
4*i+1 = 0
4*i+1 = 0 // - 1
4*i = -1 // : 4
i = -1/4
i in (-oo:-1/4) U (-1/4:+oo)
(-(4*i)-4)/(4*i+1) = 0
(-4*i-4)/(4*i+1) = 0
-4*i-4 = 0 // + 4
-4*i = 4 // : -4
i = 4/(-4)
i = -1
i = -1
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