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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
15/n = 0.025 // - 0.025
15/n-0.025 = 0
15*n^-1 = 0.025 // : 15
n^-1 = 0.00166667
-1 < 0
1/(n^1) = 0.00166667 // * n^1
1 = 0.00166667*n^1 // : 0.00166667
599.9988 = n^1
n = 599.9988
n = 599.9988
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