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D( i )
12*i = 0
12*i = 0
12*i = 0
12*i = 0 // : 12
i = 0
i in (-oo:0) U (0:+oo)
(9*i+4)/(12*i) = 0
9*i+4 = 0 // - 4
9*i = -4 // : 9
i = -4/9
i = -4/9
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