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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
18/48 = 12/n // - 12/n
18/48-(12/n) = 0
18/48-12*n^-1 = 0
-12*n^-1 = -3/8 // : -12
n^-1 = 1/32
-1 < 0
1/(n^1) = 1/32 // * n^1
1 = 1/32*n^1 // : 1/32
32 = n^1
n = 32
n = 32
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