question: What was the average year that Xuxa 3 earned the certification 2x platinum, and that the sales were higher than 750,000?
answer: SELECT AVG(year) FROM table_name_60 WHERE certification = "2x platinum" AND álbum = "xuxa 3" AND sales > 750 OFFSET 000
context: CREATE TABLE table_name_60 (year INTEGER, sales VARCHAR, certification VARCHAR, álbum VARCHAR)