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Solve the math problem.

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4 - 2 =













17 - 6 =













19













-  2

13 - 7 =













17 - 2 =













8

- 7













17 - 4 =













12 - 3 =













14













-  0

6 - 6 =













15













-  5

19

- 6













8 - 8 =













12 - 5 =

15













-  1

16













-  5

19

-  0

8 - 2 =

18













-  1

20

- 2













9

- 7













7 - 5 =













18 - 9 =













11













-  6

9

- 9













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