CREATE TABLE table_54447 ("Team" TEXT, "Played" FLOAT, "Draw" FLOAT, "Lost" FLOAT, "Goals For" FLOAT, "Goals Against" FLOAT, "Goal Difference" FLOAT, "Points" FLOAT)

Name the average goal difference for draw of 7 and played more than 18
SELECT AVG("Goal Difference") FROM table_54447 WHERE "Draw" = '7' AND "Played" > '18'
SELECT AVG("Goal Difference") FROM "table_54447" WHERE "Draw" = '7' AND "Played" > '18'