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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
18/27 = 8/n // - 8/n
18/27-(8/n) = 0
18/27-8*n^-1 = 0
-8*n^-1 = -2/3 // : -8
n^-1 = 1/12
-1 < 0
1/(n^1) = 1/12 // * n^1
1 = 1/12*n^1 // : 1/12
12 = n^1
n = 12
n = 12
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