|18| - |3|

To solve the expression |18| - |3|, we first evaluate the absolute values:

• The absolute value of 18 is 18, i.e., |18| = 18.
• The absolute value of 3 is 3, i.e., |3| = 3.

Now, substitute these values into the expression:

18 - 3 = 15.

Therefore, |18| - |3| = 15.