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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
35/n = 1 // - 1
35/n-1 = 0
35*n^-1 = 1 // : 35
n^-1 = 1/35
-1 < 0
1/(n^1) = 1/35 // * n^1
1 = 1/35*n^1 // : 1/35
35 = n^1
n = 35
n = 35
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