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Answer: **-5**

The pattern here is in **columns**. In each column, the difference between the top number and the middle number is **the sum of the digits** of the bottom number:

- 9 - 6 =
**3**(1 + 2) - 38 - 35 =
**3**(2 + 1) - 47 - 42 =
**5**(2 + 3)

In the last column the digits 2 and 7 add up to 9. Taking 9 away from 4 gives us **-5**.

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