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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
52/24 = 91/n // - 91/n
52/24-(91/n) = 0
52/24-91*n^-1 = 0
-91*n^-1 = -13/6 // : -91
n^-1 = 1/42
-1 < 0
1/(n^1) = 1/42 // * n^1
1 = 1/42*n^1 // : 1/42
42 = n^1
n = 42
n = 42
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