To find the missing value (?), you can rearrange the equation:
\[ ? + 308 - 126 = 450 \]
First, simplify \(308 - 126\):
\[ 308 - 126 = 182 \]
Now the equation is:
\[ ? + 182 = 450 \]
Next, isolate the question mark by subtracting 182 from both sides:
\[ ? = 450 - 182 \]
Calculating that gives:
\[ ? = 268 \]
So, the missing value is:
\[ ? = 268 \]