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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
16/n = 4/17 // - 4/17
16/n-(4/17) = 0
16/n-4/17 = 0
16*n^-1 = 4/17 // : 16
n^-1 = 1/68
-1 < 0
1/(n^1) = 1/68 // * n^1
1 = 1/68*n^1 // : 1/68
68 = n^1
n = 68
n = 68
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