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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
5/n = 25/50 // - 25/50
5/n-(25/50) = 0
5/n-1/2 = 0
5*n^-1 = 1/2 // : 5
n^-1 = 1/10
-1 < 0
1/(n^1) = 1/10 // * n^1
1 = 1/10*n^1 // : 1/10
10 = n^1
n = 10
n = 10
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