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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
15 = 225/n // - 225/n
15-(225/n) = 0
15-225*n^-1 = 0
-225*n^-1 = -15 // : -225
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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