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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
14/n = 3/8 // - 3/8
14/n-(3/8) = 0
14/n-3/8 = 0
14*n^-1 = 3/8 // : 14
n^-1 = 3/112
-1 < 0
1/(n^1) = 3/112 // * n^1
1 = 3/112*n^1 // : 3/112
112/3 = n^1
n = 112/3
n = 112/3
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