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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
2/3 = 24/n // - 24/n
2/3-(24/n) = 0
2/3-24*n^-1 = 0
-24*n^-1 = -2/3 // : -24
n^-1 = 1/36
-1 < 0
1/(n^1) = 1/36 // * n^1
1 = 1/36*n^1 // : 1/36
36 = n^1
n = 36
n = 36
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