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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
-16/26 = -8/n // + -8/n
-(-8/n)-16/26 = 0
8*n^-1-16/26 = 0
8*n^-1 = 8/13 // : 8
n^-1 = 1/13
-1 < 0
1/(n^1) = 1/13 // * n^1
1 = 1/13*n^1 // : 1/13
13 = n^1
n = 13
n = 13
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