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Solve the math problem.

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19













-  2

8 - 8 =













18 - 9 =













9

- 9













8 - 2 =

15













-  1

20

- 2













12 - 5 =

17 - 4 =













15













-  5

14













-  0

9

- 7













17 - 2 =













17 - 6 =













6 - 6 =













12 - 3 =













19

-  0

16













-  5

19

- 6













11













-  6

13 - 7 =













4 - 2 =













7 - 5 =













8

- 7













18













-  1

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