Solve the Equation: Finding the Number in x - 0 = 63

$?-0=63$

To solve this problem, we need to understand the effect of subtracting zero from any number:

• Step 1: Recognize the property of subtraction involving zero, which states $x - 0 = x$ for any real number $x$.
• Step 2: Applying this property to the given equation $? - 0 = 63$, we see that removing zero from a number does not change its value. Therefore, the unknown value must equal the result.

With these steps, it becomes clear that the value of the unknown, represented by the question mark, is simply 63.

Thus, the solution to the problem is $63$.