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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
8/22 = 20/n // - 20/n
8/22-(20/n) = 0
8/22-20*n^-1 = 0
-20*n^-1 = -4/11 // : -20
n^-1 = 1/55
-1 < 0
1/(n^1) = 1/55 // * n^1
1 = 1/55*n^1 // : 1/55
55 = n^1
n = 55
n = 55
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