Find the difference. $\quad-9-3$ $-12$ 12 6 $-6$

Step 1 ：The problem is asking for the difference between -9 and -3. In other words, it's asking what you get when you subtract 3 from -9.

Step 2 ：Let's denote -9 as num1 and 3 as num2.

Step 3 ：The difference between num1 and num2 is calculated as num1 - num2.

Step 4 ：So, the difference between -9 and 3 is -12.

Step 5 ：\(\boxed{-12}\) is the final answer.