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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
12/x-3 < 6 // - 6
12/x-6-3 < 0
12*x^-1 < 9
12*x^-1 < 9 // : 12
x^-1 < 9/12
x^-1 < 3/4
1/(x^1) < 3/4
x <> 0
1/(x^1) < 3/4 // * x^2
(x^2)/(x^1) < 3/4*x^2
x^1 < 3/4*x^2
x-3/4*x^2 < 0
x^1*(1-3/4*x) < 0
x < 0
-(abs(x))^1*(3/4*(abs(x))^1+1) < 0 // : -(abs(x))^1
3/4*(abs(x))^1+1 > 0
3/4*(abs(x))^1 > -1 // : 3/4
(abs(x))^1 > -1/3/4
(abs(x))^1 > -4/3 // ^ 1/1
abs(x) > (-4/3)^(1/1)
abs(x) > -4/3
x in (-oo:0)
x < 0
x > 0
x^1*(1-(3/4*x^1)) < 0 // : x^1
1-(3/4*x^1) < 0
1 < 3/4*x^1 // : 3/4
1/3/4 < x^1 // ^ 1/1
(1/3/4)^(1/1) < x
x in (4/3:+oo)
x > 0
x in (-oo:0) U (4/3:+oo)
x in (-oo:0) U (4/3:+oo)
(-oo:0) U (4/3:+oo)
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