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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
5/x > 2 // - 2
5/x-2 > 0
5*x^-1 > 2
5*x^-1 > 2 // : 5
x^-1 > 2/5
1/(x^1) > 2/5
x <> 0
1/(x^1) > 2/5 // * x^2
(x^2)/(x^1) > 2/5*x^2
x^1 > 2/5*x^2
x-2/5*x^2 > 0
x^1*(1-2/5*x) > 0
x < 0
-(abs(x))^1*(2/5*(abs(x))^1+1) > 0 // : -(abs(x))^1
2/5*(abs(x))^1+1 < 0
2/5*(abs(x))^1 < -1 // : 2/5
(abs(x))^1 < -1/2/5
(abs(x))^1 < -5/2 // ^ 1/1
abs(x) < (-5/2)^(1/1)
abs(x) < -5/2
x belongs to the empty set
x < 0
x > 0
x^1*(1-(2/5*x^1)) > 0 // : x^1
1-(2/5*x^1) > 0
1 > 2/5*x^1 // : 2/5
1/2/5 > x^1 // ^ 1/1
(1/2/5)^(1/1) > x
x in (0:5/2)
x > 0
x in (0:5/2)
x in (0:5/2)
(0:5/2)
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