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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
7-(2/x) < 5/x // - 5/x
7-(2/x)-(5/x) < 0
7-2*x^-1-5*x^-1 < 0
-7*x^-1 < -7
-7*x^-1 < -7 // * -1
7*x^-1 > 7
7*x^-1 > 7 // : 7
x^-1 > 7/7
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 belongs to the empty set
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 (0:1)
x > 0
x in (0:1)
x in (0:1)
(0:1)
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