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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
8/12 = 17/n // - 17/n
8/12-(17/n) = 0
8/12-17*n^-1 = 0
-17*n^-1 = -2/3 // : -17
n^-1 = 2/51
-1 < 0
1/(n^1) = 2/51 // * n^1
1 = 2/51*n^1 // : 2/51
51/2 = n^1
n = 51/2
n = 51/2
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