Name the average goal difference for draw of 7 and played more than 18
CREATE TABLE table_54447 (
    "Team" text,
    "Played" real,
    "Draw" real,
    "Lost" real,
    "Goals For" real,
    "Goals Against" real,
    "Goal Difference" real,
    "Points" real
)
SELECT AVG("Goal Difference") FROM table_54447 WHERE "Draw" = '7' AND "Played" > '18'
Below are sql tables schemas paired with instruction that describes a task. Using valid SQLite, write a response that appropriately completes the request for the provided tables. ### Instruction: Name the average goal difference for draw of 7 and played more than 18 ### Input: CREATE TABLE table_54447 (
    "Team" text,
    "Played" real,
    "Draw" real,
    "Lost" real,
    "Goals For" real,
    "Goals Against" real,
    "Goal Difference" real,
    "Points" real
) ### Response: SELECT AVG("Goal Difference") FROM table_54447 WHERE "Draw" = '7' AND "Played" > '18'