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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
3/5 = 18/n // - 18/n
3/5-(18/n) = 0
3/5-18*n^-1 = 0
-18*n^-1 = -3/5 // : -18
n^-1 = 1/30
-1 < 0
1/(n^1) = 1/30 // * n^1
1 = 1/30*n^1 // : 1/30
30 = n^1
n = 30
n = 30
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