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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
14/n = 5/6 // - 5/6
14/n-(5/6) = 0
14/n-5/6 = 0
14*n^-1 = 5/6 // : 14
n^-1 = 5/84
-1 < 0
1/(n^1) = 5/84 // * n^1
1 = 5/84*n^1 // : 5/84
84/5 = n^1
n = 84/5
n = 84/5
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