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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
-2.4/16.8 = -3/n // + -3/n
-(-3/n)-2.4/16.8 = 0
3*n^-1-2.4/16.8 = 0
3*n^-1 = 0.14285714 // : 3
n^-1 = 0.04761905
-1 < 0
1/(n^1) = 0.04761905 // * n^1
1 = 0.04761905*n^1 // : 0.04761905
20.99999895 = n^1
n = 20.99999895
n = 20.99999895
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