Below is an instruction that describes a task. Write a response that appropriately completes the request.

### Instruction:
Name the average goal difference for draw of 7 and played more than 18

### Inputs:
table_name: table, columns: ['Team', 'Played', 'Draw', 'Lost', 'Goals For', 'Goals Against', 'Goal Difference', 'Points']

### Response:
SELECT AVG Goal Difference FROM table WHERE Draw = 7 AND Played > 18