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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
(43/4)/n = ((71/2)/41)/3 // - ((71/2)/41)/3
(43/4)/n-(((71/2)/41)/3) = 0
(43/4)/n-71/246 = 0
43/4*n^-1 = 71/246 // : 43/4
n^-1 = 142/5289
-1 < 0
1/(n^1) = 142/5289 // * n^1
1 = 142/5289*n^1 // : 142/5289
5289/142 = n^1
n = 5289/142
n = 5289/142
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