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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
22/6 = 44/n // - 44/n
22/6-(44/n) = 0
22/6-44*n^-1 = 0
-44*n^-1 = -11/3 // : -44
n^-1 = 1/12
-1 < 0
1/(n^1) = 1/12 // * n^1
1 = 1/12*n^1 // : 1/12
12 = n^1
n = 12
n = 12
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