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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
0.5/n = 12.5 // - 12.5
0.5/n-12.5 = 0
0.5*n^-1 = 12.5 // : 0.5
n^-1 = 25
-1 < 0
1/(n^1) = 25 // * n^1
1 = 25*n^1 // : 25
1/25 = n^1
n = 1/25
n = 1/25
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