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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
1/n = 14/28 // - 14/28
1/n-(14/28) = 0
1/n-1/2 = 0
1*n^-1 = 1/2 // : 1
n^-1 = 1/2
-1 < 0
1/(n^1) = 1/2 // * n^1
1 = 1/2*n^1 // : 1/2
2 = n^1
n = 2
n = 2
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