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