CREATE TABLE table_72740 ("Game" FLOAT, "Date" CLOB, "Opponent" CLOB, "Result" CLOB, "Oilers points" FLOAT, "Opponents" FLOAT, "Oilers first downs" FLOAT, "Record" CLOB, "Attendance" FLOAT)

What was the total opponents points for the game were the Oilers scored 21?
SELECT "Opponents" FROM table_72740 WHERE "Oilers points" = '21'
SELECT "Opponents" FROM "table_72740" WHERE "Oilers points" = '21'