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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
3/7 > 6/x // - 6/x
3/7-(6/x) > 0
3/7-6*x^-1 > 0
-6*x^-1 > -3/7
-6*x^-1 > -3/7 // * -1
6*x^-1 < 3/7
6*x^-1 < 3/7 // : 6
x^-1 < 3/7/6
x^-1 < 1/14
1/(x^1) < 1/14
x <> 0
1/(x^1) < 1/14 // * x^2
(x^2)/(x^1) < 1/14*x^2
x^1 < 1/14*x^2
x-1/14*x^2 < 0
x^1*(1-1/14*x) < 0
x < 0
-(abs(x))^1*(1/14*(abs(x))^1+1) < 0 // : -(abs(x))^1
1/14*(abs(x))^1+1 > 0
1/14*(abs(x))^1 > -1 // : 1/14
(abs(x))^1 > -1/1/14
(abs(x))^1 > -14 // ^ 1/1
abs(x) > (-14)^(1/1)
abs(x) > -14
x in (-oo:0)
x < 0
x > 0
x^1*(1-(1/14*x^1)) < 0 // : x^1
1-(1/14*x^1) < 0
1 < 1/14*x^1 // : 1/14
1/1/14 < x^1 // ^ 1/1
(1/1/14)^(1/1) < x
x in (14:+oo)
x > 0
x in (-oo:0) U (14:+oo)
x in (-oo:0) U (14:+oo)
(-oo:0) U (14:+oo)
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