Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
### Context:
CREATE TABLE table_name_78 (year INTEGER, regular_season VARCHAR, playoffs VARCHAR, open_cup VARCHAR)
### Question:
What was the average year that the Nashville Metros did not qualify for the Playoffs, did not qualify for the Open Cup, and had the Regular Season 7th, Southeast?
### Answer:
SELECT AVG(year) FROM table_name_78 WHERE playoffs = "did not qualify" AND open_cup = "did not qualify" AND regular_season = "7th, southeast"