find the value of a missing number in a subtraction equation. For example, if the equation is 7 - X = 4, then X is 3.
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1 - .
0
| . 9 - 1
1 8
| 7 0 - . 7
4 3
| 9 9 - . 8
4 1
|
1 3 - . 1
2
| 3 0 - . 3
7
| 3 8 - 1 .
2 7
| 4 5 - 3 .
1 5
|
2 7 - 2 .
6
| . 6 - 5 2
3 4
| . 0 - 9
1 1
| . - 6
3
|
4 5 - . 7
1 8
| 9 4 - 9 .
1
| 7 - .
1
| 5 . - 1 5
3 7
|