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Solve the math problem.

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13 - 7 =













19

- 6













8 - 2 =

8

- 7













20

- 2













12 - 3 =













19













-  2

8 - 8 =













9

- 7













18 - 9 =













11













-  6

18













-  1

16













-  5

7 - 5 =













17 - 4 =













14













-  0

6 - 6 =













17 - 2 =













19

-  0

12 - 5 =

15













-  5

17 - 6 =













9

- 9













15













-  1

4 - 2 =













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