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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
27 = 351/n // - 351/n
27-(351/n) = 0
27-351*n^-1 = 0
-351*n^-1 = -27 // : -351
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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