Table schema:
CREATE TABLE table_name_72 (goal_difference INTEGER, played VARCHAR, goals_against VARCHAR, position VARCHAR)

Question: What is the highest Goal Difference when the goals against were less than 76, and the position larger than 5, and a Played larger than 30?
SQL: SELECT MAX(goal_difference) FROM table_name_72 WHERE goals_against < 76 AND position > 5 AND played > 30