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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
7/x > 4 // - 4
7/x-4 > 0
7*x^-1 > 4
7*x^-1 > 4 // : 7
x^-1 > 4/7
1/(x^1) > 4/7
x <> 0
1/(x^1) > 4/7 // * x^2
(x^2)/(x^1) > 4/7*x^2
x^1 > 4/7*x^2
x-4/7*x^2 > 0
x^1*(1-4/7*x) > 0
x < 0
-(abs(x))^1*(4/7*(abs(x))^1+1) > 0 // : -(abs(x))^1
4/7*(abs(x))^1+1 < 0
4/7*(abs(x))^1 < -1 // : 4/7
(abs(x))^1 < -1/4/7
(abs(x))^1 < -7/4 // ^ 1/1
abs(x) < (-7/4)^(1/1)
abs(x) < -7/4
x belongs to the empty set
x < 0
x > 0
x^1*(1-(4/7*x^1)) > 0 // : x^1
1-(4/7*x^1) > 0
1 > 4/7*x^1 // : 4/7
1/4/7 > x^1 // ^ 1/1
(1/4/7)^(1/1) > x
x in (0:7/4)
x > 0
x in (0:7/4)
x in (0:7/4)
(0:7/4)
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