Rozwiąż nierówność `|2x−5| <= 3`
`x in (: 1;4 :)`
`x in (: -1;4 :)`
`x in (: -4;-1 :)`
`x in (: -4;1 :)`
`|x| <= a vv |x| >= -a`
`2x−5 <= 3` `2x−5>=−3` `2x <= 8` `2x >= 2` `x<=4` `x>=1`