PREFIX  dc:  <http://purl.org/dc/elements/1.1/>
PREFIX  ns:  <http://example.org/ns#> 
SELECT  ?title ?price
WHERE   { ?x ns:price ?price .
          FILTER ((?price < 30 || ((?x + 2) * 3) = "4") = false) .
          ?x dc:title ?title . }