Modular arithmetic example demonstrating subtraction and modulo operations.
Step-by-step mathematical calculation showing subtraction and modular arithmetic: (73 - 64) mod 5 = 9 mod 5 = 4 mod 5, followed by finding numbers mod 5 first: (73 - 64) mod 5 ≡ 3 mod 5 - 4 mod 5 ≡ -1 mod 5 ≡ 4 mod 5.