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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
9/5 = 21/n // - 21/n
9/5-(21/n) = 0
9/5-21*n^-1 = 0
-21*n^-1 = -9/5 // : -21
n^-1 = 3/35
-1 < 0
1/(n^1) = 3/35 // * n^1
1 = 3/35*n^1 // : 3/35
35/3 = n^1
n = 35/3
n = 35/3
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