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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
20/n = 5 // - 5
20/n-5 = 0
20*n^-1 = 5 // : 20
n^-1 = 1/4
-1 < 0
1/(n^1) = 1/4 // * n^1
1 = 1/4*n^1 // : 1/4
4 = n^1
n = 4
n = 4
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