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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
-8/3 = -15/n // + -15/n
-(-15/n)-8/3 = 0
15*n^-1-8/3 = 0
15*n^-1 = 8/3 // : 15
n^-1 = 8/45
-1 < 0
1/(n^1) = 8/45 // * n^1
1 = 8/45*n^1 // : 8/45
45/8 = n^1
n = 45/8
n = 45/8
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