Solve the Equation: Finding the Value in ? - 0 = 203

To solve this problem, let's apply the property of subtraction with zero. The basic rule is that subtracting zero from any number does not change the number. In mathematical terms, this is expressed as $x - 0 = x$.

Given the question $(? - 0 = 203)$, we'll use the property that the number remains unchanged. Therefore, to find the number for which this property holds:

• Step 1: We start with the equation $x - 0 = 203$.
• Step 2: By the property of zero, we know $x = 203$.

This straightforward conclusion shows that the number, when zero is subtracted, equals 203, confirming that the missing number is indeed $203$.

Thus, the correct answer to the problem is $\boxed{203}$.