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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
((5/3)/15)/9 = 75/n // - 75/n
((5/3)/15)/9-(75/n) = 0
((5/3)/15)/9-75*n^-1 = 0
-75*n^-1 = -1/81 // : -75
n^-1 = 1/6075
-1 < 0
1/(n^1) = 1/6075 // * n^1
1 = 1/6075*n^1 // : 1/6075
6075 = n^1
n = 6075
n = 6075
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