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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
5/n-10 < 15 // - 15
5/n-15-10 < 0
5*n^-1 < 25
5*n^-1 < 25 // : 5
n^-1 < 25/5
n^-1 < 5
1/(n^1) < 5
n <> 0
1/(n^1) < 5 // * n^2
(n^2)/(n^1) < 5*n^2
n^1 < 5*n^2
n-5*n^2 < 0
n^1*(1-5*n) < 0
n < 0
-(abs(n))^1*(5*(abs(n))^1+1) < 0 // : -(abs(n))^1
5*(abs(n))^1+1 > 0
5*(abs(n))^1 > -1 // : 5
(abs(n))^1 > -1/5
(abs(n))^1 > -1/5 // ^ 1/1
abs(n) > (-1/5)^(1/1)
abs(n) > -1/5
n in (-oo:0)
n < 0
n > 0
n^1*(1-(5*n^1)) < 0 // : n^1
1-(5*n^1) < 0
1 < 5*n^1 // : 5
1/5 < n^1 // ^ 1/1
(1/5)^(1/1) < n
n in (1/5:+oo)
n > 0
n in (-oo:0) U (1/5:+oo)
n in (-oo:0) U (1/5:+oo)
(-oo:0) U (1/5:+oo)
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