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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
4/n-8 = 8-2 // - 8-2
4/n-8-8+2 = 0
4*n^-1 = 14 // : 4
n^-1 = 7/2
-1 < 0
1/(n^1) = 7/2 // * n^1
1 = 7/2*n^1 // : 7/2
2/7 = n^1
n = 2/7
n = 2/7
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