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