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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
22/6 = 88/n // - 88/n
22/6-(88/n) = 0
22/6-88*n^-1 = 0
-88*n^-1 = -11/3 // : -88
n^-1 = 1/24
-1 < 0
1/(n^1) = 1/24 // * n^1
1 = 1/24*n^1 // : 1/24
24 = n^1
n = 24
n = 24
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