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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
2/4 = 8/n-6 // - 8/n-6
2/4-(8/n)+6 = 0
2/4-8*n^-1+6 = 0
-8*n^-1 = -13/2 // : -8
n^-1 = 13/16
-1 < 0
1/(n^1) = 13/16 // * n^1
1 = 13/16*n^1 // : 13/16
16/13 = n^1
n = 16/13
n = 16/13
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