1. The problem is to express subtraction in the format similar to $5 - 5 = 0$. 2. Subtraction is a binary operation that represents the difference between two numbers. 3. The format $a - b = c$ means when you subtract $b$ from $a$, the result is $c$. 4. For example, $5 - 5 = 0$ shows that subtracting 5 from 5 gives 0. 5. You can apply this format to any two numbers, for example: $8 - 3 = 5$ or $10 - 4 = 6$. 6. It is a standard way to state subtraction problems clearly with input and output. Final answer: Any subtraction can be written as $a - b = c$ where $c$ is the difference of $a$ and $b$.