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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
3/7 = 258/n // - 258/n
3/7-(258/n) = 0
3/7-258*n^-1 = 0
-258*n^-1 = -3/7 // : -258
n^-1 = 1/602
-1 < 0
1/(n^1) = 1/602 // * n^1
1 = 1/602*n^1 // : 1/602
602 = n^1
n = 602
n = 602
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