495-?=129+246

To solve the equation \( 495 - ? = 129 + 246 \), first, we need to calculate the right side of the equation:

\[ 129 + 246 = 375 \]

Now, we can rewrite the equation:

\[ 495 - ? = 375 \]

Next, we can isolate the question mark by subtracting 375 from 495:

\[ ? = 495 - 375 \]

Now perform the subtraction:

\[ ? = 120 \]

So, the answer is \( ? = 120 \).