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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
(12/3)/4 = 48/n // - 48/n
(12/3)/4-(48/n) = 0
(12/3)/4-48*n^-1 = 0
-48*n^-1 = -1 // : -48
n^-1 = 1/48
-1 < 0
1/(n^1) = 1/48 // * n^1
1 = 1/48*n^1 // : 1/48
48 = n^1
n = 48
n = 48
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