Question
Try to get the center number by doing addition or subtraction.



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| 8 | 4 | 1 |
| - 6 | - 2 | - 0 |
| 7 | 9 | 5 |
| - 5 | - 8 | - 0 |

| $7$ $+ 1$ |
| $9$ $+ 0$ |
| $8$ $+ 1$ |




| $5$ $+ 3$ |
| $2$ $+ 2$ |
| $1$ $+ 6$ |