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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
9/x-5 < 2003 // - 2003
9/x-2003-5 < 0
9*x^-1 < 2008
9*x^-1 < 2008 // : 9
x^-1 < 2008/9
1/(x^1) < 2008/9
x <> 0
1/(x^1) < 2008/9 // * x^2
(x^2)/(x^1) < 2008/9*x^2
x^1 < 2008/9*x^2
x-2008/9*x^2 < 0
x^1*(1-2008/9*x) < 0
x < 0
-(abs(x))^1*(2008/9*(abs(x))^1+1) < 0 // : -(abs(x))^1
2008/9*(abs(x))^1+1 > 0
2008/9*(abs(x))^1 > -1 // : 2008/9
(abs(x))^1 > -1/2008/9
(abs(x))^1 > -9/2008 // ^ 1/1
abs(x) > (-9/2008)^(1/1)
abs(x) > -9/2008
x in (-oo:0)
x < 0
x > 0
x^1*(1-(2008/9*x^1)) < 0 // : x^1
1-(2008/9*x^1) < 0
1 < 2008/9*x^1 // : 2008/9
1/2008/9 < x^1 // ^ 1/1
(1/2008/9)^(1/1) < x
x in (9/2008:+oo)
x > 0
x in (-oo:0) U (9/2008:+oo)
x in (-oo:0) U (9/2008:+oo)
(-oo:0) U (9/2008:+oo)
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