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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
64/x > 8 // - 8
64/x-8 > 0
64*x^-1 > 8
64*x^-1 > 8 // : 64
x^-1 > 8/64
x^-1 > 1/8
1/(x^1) > 1/8
x <> 0
1/(x^1) > 1/8 // * x^2
(x^2)/(x^1) > 1/8*x^2
x^1 > 1/8*x^2
x-1/8*x^2 > 0
x^1*(1-1/8*x) > 0
x < 0
-(abs(x))^1*(1/8*(abs(x))^1+1) > 0 // : -(abs(x))^1
1/8*(abs(x))^1+1 < 0
1/8*(abs(x))^1 < -1 // : 1/8
(abs(x))^1 < -1/1/8
(abs(x))^1 < -8 // ^ 1/1
abs(x) < (-8)^(1/1)
abs(x) < -8
x belongs to the empty set
x < 0
x > 0
x^1*(1-(1/8*x^1)) > 0 // : x^1
1-(1/8*x^1) > 0
1 > 1/8*x^1 // : 1/8
1/1/8 > x^1 // ^ 1/1
(1/1/8)^(1/1) > x
x in (0:8)
x > 0
x in (0:8)
x in (0:8)
(0:8)
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