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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
5/15 = 6/n // - 6/n
5/15-(6/n) = 0
5/15-6*n^-1 = 0
-6*n^-1 = -1/3 // : -6
n^-1 = 1/18
-1 < 0
1/(n^1) = 1/18 // * n^1
1 = 1/18*n^1 // : 1/18
18 = n^1
n = 18
n = 18
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