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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
18/24 = 27/n // - 27/n
18/24-(27/n) = 0
18/24-27*n^-1 = 0
-27*n^-1 = -3/4 // : -27
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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