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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
6/n = (5/2)/27 // - (5/2)/27
6/n-((5/2)/27) = 0
6/n-5/54 = 0
6*n^-1 = 5/54 // : 6
n^-1 = 5/324
-1 < 0
1/(n^1) = 5/324 // * n^1
1 = 5/324*n^1 // : 5/324
324/5 = n^1
n = 324/5
n = 324/5
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