∣2x−11∣≥1                                                       i       ∣2x−11∣≤7
(2x−11≥1   ∣+11   lub   2x−11≤−1   ∣+11)       i       (2x−11≤7   ∣+11   i   2x−11≥−7   ∣+11)
(2x≥12   ∣:2          lub   2x≤10   ∣:2)                  i      (2x≤18   ∣:2           i   2x≥4  ∣:2)
(x≥6                    lub   x≤5)                             i      (x≤9                     i   x≥2)
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