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D( i )
i = 0
i = 0
i = 0
i in (-oo:0) U (0:+oo)
12/i = 14/3.5 // - 14/3.5
12/i-(14/3.5) = 0
12/i-4 = 0
12*i^-1 = 4 // : 12
i^-1 = 1/3
-1 < 0
1/(i^1) = 1/3 // * i^1
1 = 1/3*i^1 // : 1/3
3 = i^1
i = 3
i = 3
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