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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
-2.4/10.5 = -8/n // + -8/n
-(-8/n)-2.4/10.5 = 0
8*n^-1-2.4/10.5 = 0
8*n^-1 = 0.22857143 // : 8
n^-1 = 0.02857143
-1 < 0
1/(n^1) = 0.02857143 // * n^1
1 = 0.02857143*n^1 // : 0.02857143
34.99999825 = n^1
n = 34.99999825
n = 34.99999825
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