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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
2/n+6/8 = 0
2*n^-1 = -3/4 // : 2
n^-1 = -3/8
-1 < 0
1/(n^1) = -3/8 // * n^1
1 = -3/8*n^1 // : -3/8
-8/3 = n^1
n = -8/3
n = -8/3
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