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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
0.3/n = 4.75/14.25 // - 4.75/14.25
0.3/n-(4.75/14.25) = 0
0.3/n-0.33333333 = 0
0.3*n^-1 = 0.33333333 // : 0.3
n^-1 = 1.1111111
-1 < 0
1/(n^1) = 1.1111111 // * n^1
1 = 1.1111111*n^1 // : 1.1111111
0.90000001 = n^1
n = 0.90000001
n = 0.90000001
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