1. The problem is to calculate $5 - 5$. 2. The subtraction operation means taking away the second number from the first. 3. Using the formula for subtraction: $$a - b = c$$ where $a=5$ and $b=5$. 4. Substitute the values: $$5 - 5 = 0$$. 5. Therefore, the result of $5 - 5$ is $0$.