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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
3/9 = 5/n // - 5/n
3/9-(5/n) = 0
3/9-5*n^-1 = 0
-5*n^-1 = -1/3 // : -5
n^-1 = 1/15
-1 < 0
1/(n^1) = 1/15 // * n^1
1 = 1/15*n^1 // : 1/15
15 = n^1
n = 15
n = 15
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