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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
15/n-3 = 5/n-8-3 // - 5/n-8-3
15/n-(5/n)-3+3+8 = 0
15/n-5*n^-1-3+3+8 = 0
10*n^-1 = -8 // : 10
n^-1 = -4/5
-1 < 0
1/(n^1) = -4/5 // * n^1
1 = -4/5*n^1 // : -4/5
-5/4 = n^1
n = -5/4
n = -5/4
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