To find the answer to the equation 854,121 = 954,121 -, let's break it down step by step:
1. The equation is asking us to subtract something from 954,121 in order to get a result of 854,121.
2. To find the missing value, we need to subtract the two numbers: 954,121 - 854,121.
3. Subtracting the numbers, we get 100,000.
Therefore, the missing value in the equation is 100,000.