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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
((1/4)/2)/3 = (3/5)/n // - (3/5)/n
((1/4)/2)/3-((3/5)/n) = 0
(-3/5)*n^-1+((1/4)/2)/3 = 0
-3/5*n^-1 = -1/24 // : -3/5
n^-1 = 5/72
-1 < 0
1/(n^1) = 5/72 // * n^1
1 = 5/72*n^1 // : 5/72
72/5 = n^1
n = 72/5
n = 72/5
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