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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
-3.5/25.2 = -5/n // + -5/n
-(-5/n)-3.5/25.2 = 0
5*n^-1-3.5/25.2 = 0
5*n^-1 = 0.13888889 // : 5
n^-1 = 0.02777778
-1 < 0
1/(n^1) = 0.02777778 // * n^1
1 = 0.02777778*n^1 // : 0.02777778
35.99999712 = n^1
n = 35.99999712
n = 35.99999712
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