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D( i )
4*i+4 = 0
4*i+4 = 0
4*i+4 = 0
4*i+4 = 0 // - 4
4*i = -4 // : 4
i = -4/4
i = -1
i in (-oo:-1) U (-1:+oo)
(3*i)/(4*i+4) = 0
3*i = 0 // : 3
i = 0
i = 0
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