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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
abs(7/x-2) = 14 // - 14
abs(7/x-2)-14 = 0
abs(7/x-2)-14 = 0
x in (-oo:+oo)
abs(7/x-2)
7/x-2 >= 0
7*x^-1 >= 2
7*x^-1 >= 2 // : 7
x^-1 >= 2/7
1/(x^1) >= 2/7
x <> 0
1/(x^1) >= 2/7 // * x^2
(x^2)/(x^1) >= 2/7*x^2
x^1 >= 2/7*x^2
x-2/7*x^2 >= 0
x^1*(1-2/7*x) >= 0
x < 0
-(abs(x))^1*(2/7*(abs(x))^1+1) >= 0 // : -(abs(x))^1
2/7*(abs(x))^1+1 <= 0
2/7*(abs(x))^1 <= -1 // : 2/7
(abs(x))^1 <= -1/2/7
(abs(x))^1 <= -7/2 // ^ 1/1
abs(x) <= (-7/2)^(1/1)
abs(x) <= -7/2
x belongs to the empty set
x < 0
x > 0
x^1*(1-(2/7*x^1)) >= 0 // : x^1
1-(2/7*x^1) >= 0
1 >= 2/7*x^1 // : 2/7
1/2/7 >= x^1 // ^ 1/1
(1/2/7)^(1/1) >= x
x in (0:7/2>
x > 0
x in (0:7/2>
x in (0:7/2>
7/x-14-2 = 0
x in (-oo:0> U (7/2:+oo)
2-(7/x)-14 = 0
abs(7/x-2)-14 = 0
/ | 2-(7/x)-14 = 0 i x in (-oo:0> U (7/2:+oo) | 7/x-14-2 = 0 i x in (0:7/2>
x in (-oo:0> U (7/2:+oo)
2-(7/x)-14 = 0
-7*x^-1 = 12 // : -7
x^-1 = -12/7
-1 < 0
1/(x^1) = -12/7 // * x^1
1 = -12/7*x^1 // : -12/7
-7/12 = x^1
x = -7/12
x in (0:7/2>
7/x-14-2 = 0
7*x^-1 = 16 // : 7
x^-1 = 16/7
-1 < 0
1/(x^1) = 16/7 // * x^1
1 = 16/7*x^1 // : 16/7
7/16 = x^1
x = 7/16
x in { -7/12, 7/16 }
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