user: Question: What was the average year that xuxa 3 earned the certification 2x platinum, and that the sales were higher than 750000?
Columns: ['Year', 'Álbum', 'Charts', 'Sales', 'Certification']
Types: ['real', 'text', 'text', 'real', 'text']
Sample row: [1990.0, 'Xuxa 1', 'No. 1 Latin Charts', 2500000.0, '1x Diamond']
SQL:

assistant: SELECT AVG("Year") FROM "Table" WHERE "Certification" = '2x platinum' AND "Álbum" = 'xuxa 3' AND "Sales" > 750000.0;