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Solve the math problem.

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4 - 2 =













8

- 7













11













-  6

8 - 8 =













17 - 2 =













14













-  0

19

- 6













12 - 5 =

19

-  0

15













-  1

6 - 6 =













9

- 9













19













-  2

7 - 5 =













16













-  5

9

- 7













17 - 4 =













15













-  5

8 - 2 =

18













-  1

18 - 9 =













17 - 6 =













20

- 2













12 - 3 =













13 - 7 =













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