Solve the exercise
F ? 0
AAA-5-5-5BBB-4-4-4CCC-3-3-3DDD-2-2-2EEE-1-1-1FFF000GGG111HHH222III333JJJ444KKK555LLL666
Let's look at the number line and locate the letters:
F=0 F=0 F=0
Therefore:
0=0 0=0 0=0