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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
2/n = 3/12 // - 3/12
2/n-(3/12) = 0
2/n-1/4 = 0
2*n^-1 = 1/4 // : 2
n^-1 = 1/8
-1 < 0
1/(n^1) = 1/8 // * n^1
1 = 1/8*n^1 // : 1/8
8 = n^1
n = 8
n = 8
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