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Solve the math problem.

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6 - 6 =













11













-  6

12 - 5 =

14













-  0

16













-  5

19

- 6













19













-  2

8

- 7













9

- 7













13 - 7 =













18













-  1

7 - 5 =













15













-  5

12 - 3 =













8 - 8 =













17 - 6 =













15













-  1

17 - 4 =













19

-  0

17 - 2 =













4 - 2 =













18 - 9 =













8 - 2 =

20

- 2













9

- 9













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