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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
4/6 = 22/n // - 22/n
4/6-(22/n) = 0
4/6-22*n^-1 = 0
-22*n^-1 = -2/3 // : -22
n^-1 = 1/33
-1 < 0
1/(n^1) = 1/33 // * n^1
1 = 1/33*n^1 // : 1/33
33 = n^1
n = 33
n = 33
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