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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
1/0.19 = 12/n // - 12/n
1/0.19-(12/n) = 0
1/0.19-12*n^-1 = 0
-12*n^-1 = -5.26315789 // : -12
n^-1 = 0.43859649
-1 < 0
1/(n^1) = 0.43859649 // * n^1
1 = 0.43859649*n^1 // : 0.43859649
2.28000001 = n^1
n = 2.28000001
n = 2.28000001
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