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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
17/9 = 51/n // - 51/n
17/9-(51/n) = 0
17/9-51*n^-1 = 0
-51*n^-1 = -17/9 // : -51
n^-1 = 1/27
-1 < 0
1/(n^1) = 1/27 // * n^1
1 = 1/27*n^1 // : 1/27
27 = n^1
n = 27
n = 27
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