Elementary algebra : structure and skills 2026-02-15T15:01:24+03:00 DEBUG: VuFind\ILS\Driver\Folio: Token taken from global cache: eyJhbGciOiJIUzI1NiJ9.eyJzdWIiO... - Drooyan, Irving; Fleming, Frank J.; Hadel, Walter (Wiley, 1977)