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D( x )
abs(11-(4*x)) = 0
abs(11-(4*x)) = 0
abs(11-(4*x)) = 0
abs(11-4*x) = 0
abs(11-4*x) = 0
x in (-oo:+oo)
abs(11-4*x)
11-4*x >= 0
11-4*x >= 0 // - 11
-4*x >= -11 // : -4
x <= -11/(-4)
x <= 11/4
x in (-oo:11/4>
11-4*x = 0
x in (11/4:+oo)
-(11-4*x) = 0
abs(11-4*x) = 0
/| 11-4*x = 0 i x in (-oo:11/4>| -(11-4*x) = 0 i x in (11/4:+oo)
x in (-oo:11/4>
11-4*x = 0 // - 11
-4*x = -11 // : -4
x = -11/(-4)
x = 11/4
x in (11/4:+oo)
-(11-4*x) = 0
4*x-11 = 0 // + 11
4*x = 11 // : 4
x = 11/4
(11/4:+oo)
x in (-oo:11/4) U (11/4:+oo)
1/abs(11-(4*x)) = 10 // - 10
1/abs(11-(4*x))-10 = 0
1/abs(11-4*x)-10 = 0
1/abs(11-4*x)-10 = 0
x in (-oo:+oo)
abs(11-4*x)
11-4*x >= 0
11-4*x >= 0 // - 11
-4*x >= -11 // : -4
x <= -11/(-4)
x <= 11/4
x in (-oo:11/4>
1/(11-4*x)-10 = 0
x in (11/4:+oo)
1/(-(11-4*x))-10 = 0
1/abs(11-4*x)-10 = 0
/| 1/(11-4*x)-10 = 0 i x in (-oo:11/4>| 1/(-(11-4*x))-10 = 0 i x in (11/4:+oo)
x in (-oo:11/4>
1/(11-4*x)-10 = 0
1/(11-4*x)+(-10*(11-4*x))/(11-4*x) = 0
1-10*(11-4*x) = 0
40*x-109 = 0
(40*x-109)/(11-4*x) = 0
(40*x-109)/(11-4*x) = 0 // * 11-4*x
40*x-109 = 0
40*x-109 = 0 // + 109
40*x = 109 // : 40
x = 109/40
x in (11/4:+oo)
1/(-(11-4*x))-10 = 0
1/(4*x-11)-10 = 0
1/(4*x-11)+(-10*(4*x-11))/(4*x-11) = 0
1-10*(4*x-11) = 0
111-40*x = 0
(111-40*x)/(4*x-11) = 0
(111-40*x)/(4*x-11) = 0 // * 4*x-11
111-40*x = 0
111-40*x = 0 // - 111
-40*x = -111 // : -40
x = -111/(-40)
x = 111/40
x in { 109/40, 111/40 }
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