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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
25/n = (4/3)/20 // - (4/3)/20
25/n-((4/3)/20) = 0
25/n-1/15 = 0
25*n^-1 = 1/15 // : 25
n^-1 = 1/375
-1 < 0
1/(n^1) = 1/375 // * n^1
1 = 1/375*n^1 // : 1/375
375 = n^1
n = 375
n = 375
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