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Solve the math problem.

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8 - 8 =













15













-  5

6 - 6 =













8

- 7













12 - 3 =













17 - 2 =













4 - 2 =













20

- 2













17 - 6 =













17 - 4 =













14













-  0

8 - 2 =

12 - 5 =

19

-  0

18 - 9 =













7 - 5 =













15













-  1

11













-  6

19













-  2

9

- 9













9

- 7













19

- 6













16













-  5

18













-  1

13 - 7 =













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