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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
15/x < 5/3 // - 5/3
15/x-(5/3) < 0
15/x-5/3 < 0
15*x^-1 < 5/3
15*x^-1 < 5/3 // : 15
x^-1 < 5/3/15
x^-1 < 1/9
1/(x^1) < 1/9
x <> 0
1/(x^1) < 1/9 // * x^2
(x^2)/(x^1) < 1/9*x^2
x^1 < 1/9*x^2
x-1/9*x^2 < 0
x^1*(1-1/9*x) < 0
x < 0
-(abs(x))^1*(1/9*(abs(x))^1+1) < 0 // : -(abs(x))^1
1/9*(abs(x))^1+1 > 0
1/9*(abs(x))^1 > -1 // : 1/9
(abs(x))^1 > -1/1/9
(abs(x))^1 > -9 // ^ 1/1
abs(x) > (-9)^(1/1)
abs(x) > -9
x in (-oo:0)
x < 0
x > 0
x^1*(1-(1/9*x^1)) < 0 // : x^1
1-(1/9*x^1) < 0
1 < 1/9*x^1 // : 1/9
1/1/9 < x^1 // ^ 1/1
(1/1/9)^(1/1) < x
x in (9:+oo)
x > 0
x in (-oo:0) U (9:+oo)
x in (-oo:0) U (9:+oo)
(-oo:0) U (9:+oo)
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