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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
2/5 = 11/n // - 11/n
2/5-(11/n) = 0
2/5-11*n^-1 = 0
-11*n^-1 = -2/5 // : -11
n^-1 = 2/55
-1 < 0
1/(n^1) = 2/55 // * n^1
1 = 2/55*n^1 // : 2/55
55/2 = n^1
n = 55/2
n = 55/2
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