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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
3.5/n = 2.5/4.5 // - 2.5/4.5
3.5/n-(2.5/4.5) = 0
3.5/n-0.55555556 = 0
3.5*n^-1 = 0.55555556 // : 3.5
n^-1 = 0.15873016
-1 < 0
1/(n^1) = 0.15873016 // * n^1
1 = 0.15873016*n^1 // : 0.15873016
6.29999995 = n^1
n = 6.29999995
n = 6.29999995
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