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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
2.5/0.6 = 165/n // - 165/n
2.5/0.6-(165/n) = 0
2.5/0.6-165*n^-1 = 0
-165*n^-1 = -4.16666667 // : -165
n^-1 = 0.02525253
-1 < 0
1/(n^1) = 0.02525253 // * n^1
1 = 0.02525253*n^1 // : 0.02525253
39.59999256 = n^1
n = 39.59999256
n = 39.59999256
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