Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_15986020_3 (opponents VARCHAR, oilers_points VARCHAR)

### Question ###
What was the total opponents points for the game were the Oilers scored 21?

### Accurate SQL ###

SELECT opponents FROM table_15986020_3 WHERE oilers_points = 21