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Solve the math problem.

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6 - 6 =













16













-  5

15













-  5

20

- 2













9

- 7













8 - 8 =













17 - 4 =













9

- 9













18













-  1

4 - 2 =













19

-  0

8 - 2 =

19













-  2

19

- 6













18 - 9 =













12 - 5 =

14













-  0

8

- 7













15













-  1

11













-  6

13 - 7 =













12 - 3 =













17 - 6 =













7 - 5 =













17 - 2 =













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