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To find the missing part that can be used in both equations, we need to solve them separately.
1. For the first equation, \( 2 + \_\_ = 6 \):
- If we subtract 2 from both sides, we get:
\[ \_\_ = 6 - 2 = 4 \]
2. For the second equation, \( 6 - 2 = \_\_ \):
- Here, if we subtract 2 from 6, we get:
\[ \_\_ = 6 - 2 = 4 \]
The missing number, which satisfies both equations, is **4**. Hence, the answer is:
4