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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
18/x-4 < 6 // - 6
18/x-6-4 < 0
18*x^-1 < 10
18*x^-1 < 10 // : 18
x^-1 < 10/18
x^-1 < 5/9
1/(x^1) < 5/9
x <> 0
1/(x^1) < 5/9 // * x^2
(x^2)/(x^1) < 5/9*x^2
x^1 < 5/9*x^2
x-5/9*x^2 < 0
x^1*(1-5/9*x) < 0
x < 0
-(abs(x))^1*(5/9*(abs(x))^1+1) < 0 // : -(abs(x))^1
5/9*(abs(x))^1+1 > 0
5/9*(abs(x))^1 > -1 // : 5/9
(abs(x))^1 > -1/5/9
(abs(x))^1 > -9/5 // ^ 1/1
abs(x) > (-9/5)^(1/1)
abs(x) > -9/5
x in (-oo:0)
x < 0
x > 0
x^1*(1-(5/9*x^1)) < 0 // : x^1
1-(5/9*x^1) < 0
1 < 5/9*x^1 // : 5/9
1/5/9 < x^1 // ^ 1/1
(1/5/9)^(1/1) < x
x in (9/5:+oo)
x > 0
x in (-oo:0) U (9/5:+oo)
x in (-oo:0) U (9/5:+oo)
(-oo:0) U (9/5:+oo)
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