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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
1/8 = 55/n // - 55/n
1/8-(55/n) = 0
1/8-55*n^-1 = 0
-55*n^-1 = -1/8 // : -55
n^-1 = 1/440
-1 < 0
1/(n^1) = 1/440 // * n^1
1 = 1/440*n^1 // : 1/440
440 = n^1
n = 440
n = 440
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