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D( x )
-x = 0
-x = 0
x = 0
x in (-oo:0) U (0:+oo)
3/(-x) < 5 // - 5
3/(-x)-5 < 0
-3*x^-1 < 5
-3*x^-1 < 5 // * -1
3*x^-1 > -5
3*x^-1 > -5 // : 3
x^-1 > -5/3
1/(x^1) > -5/3
x <> 0
1/(x^1) > -5/3 // * x^2
(x^2)/(x^1) > -5/3*x^2
x^1 > -5/3*x^2
5/3*x^2+x > 0
x^1*(5/3*x+1) > 0
x < 0
-(abs(x))^1*(1-5/3*(abs(x))^1) > 0 // : -(abs(x))^1
1-5/3*(abs(x))^1 < 0
-5/3*(abs(x))^1 < -1 // : -5/3
(abs(x))^1 > -1/(-5/3)
(abs(x))^1 > 3/5 // ^ 1/1
abs(x) > (3/5)^(1/1)
abs(x) > 3/5
x in (-oo:-3/5)
x < 0
x > 0
x^1*(1-(-5/3*x^1)) > 0 // : x^1
1-(-5/3*x^1) > 0
1 > -5/3*x^1 // : -5/3
1/(-5/3) < x^1 // ^ 1/1
(1/(-5/3))^(1/1) < x
x in (0:+oo)
x > 0
x in (-oo:-3/5) U (0:+oo)
x in (-oo:-3/5) U (0:+oo)
(-oo:-3/5) U (0:+oo)
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