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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
5/855 = 41/n // - 41/n
5/855-(41/n) = 0
5/855-41*n^-1 = 0
-41*n^-1 = -1/171 // : -41
n^-1 = 1/7011
-1 < 0
1/(n^1) = 1/7011 // * n^1
1 = 1/7011*n^1 // : 1/7011
7011 = n^1
n = 7011
n = 7011
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