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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
3/n-(6/9) = 8 // - 8
3/n-(6/9)-8 = 0
3/n-2/3-8 = 0
3*n^-1 = 26/3 // : 3
n^-1 = 26/9
-1 < 0
1/(n^1) = 26/9 // * n^1
1 = 26/9*n^1 // : 26/9
9/26 = n^1
n = 9/26
n = 9/26
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