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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
(81/6)/n = ((51/2)/71)/3 // - ((51/2)/71)/3
(81/6)/n-(((51/2)/71)/3) = 0
(81/6)/n-17/142 = 0
27/2*n^-1 = 17/142 // : 27/2
n^-1 = 17/1917
-1 < 0
1/(n^1) = 17/1917 // * n^1
1 = 17/1917*n^1 // : 17/1917
1917/17 = n^1
n = 1917/17
n = 1917/17
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