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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
5/n = 4/1.6 // - 4/1.6
5/n-(4/1.6) = 0
5/n-2.5 = 0
5*n^-1 = 2.5 // : 5
n^-1 = 0.5
-1 < 0
1/(n^1) = 0.5 // * n^1
1 = 0.5*n^1 // : 0.5
2 = n^1
n = 2
n = 2
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