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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
5/n = 10/4 // - 10/4
5/n-(10/4) = 0
5/n-5/2 = 0
5*n^-1 = 5/2 // : 5
n^-1 = 1/2
-1 < 0
1/(n^1) = 1/2 // * n^1
1 = 1/2*n^1 // : 1/2
2 = n^1
n = 2
n = 2
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