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Solve the math problem.

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8 - 8 =













8

- 7













8 - 2 =

20

- 2













9

- 7













15













-  1

17 - 2 =













19

-  0

17 - 4 =













7 - 5 =













16













-  5

18













-  1

17 - 6 =













14













-  0

9

- 9













12 - 5 =

6 - 6 =













19













-  2

11













-  6

18 - 9 =













15













-  5

19

- 6













13 - 7 =













4 - 2 =













12 - 3 =













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