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_7 (week VARCHAR, result VARCHAR)
### Question:
What is the week with w 31-21 result?
### Answer:
SELECT week FROM table_name_7 WHERE result = "w 31-21"