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x in (-oo:+oo)
abs(12*x-11) < 1/13 // - 1/13
abs(12*x-11)-(1/13) < 0
abs(12*x-11)-1/13 < 0
abs(12*x-11)-1/13 < 0
x in (-oo:+oo)
abs(12*x-11)
12*x-11 >= 0
12*x-11 >= 0 // + 11
12*x >= 11 // : 12
x >= 11/12
x in <11/12:+oo)
12*x-1/13-11 < 0
x in (-oo:11/12)
11-(12*x)-1/13 < 0
abs(12*x-11)-1/13 < 0
/ | 11-(12*x)-1/13 < 0 i x in (-oo:11/12) | 12*x-1/13-11 < 0 i x in <11/12:+oo)
x in (-oo:11/12)
11-(12*x)-1/13 < 0
142/13-12*x < 0 // - 142/13
-12*x < -142/13 // : -12
x > -142/13/(-12)
x > 71/78
x in <11/12:+oo)
12*x-1/13-11 < 0
12*x-144/13 < 0 // + 144/13
12*x < 144/13 // : 12
x < 144/13/12
x < 12/13
x in (71/78:12/13)
(71/78:12/13)
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