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Solve the math problem.

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16













-  5

15













-  1

6 - 6 =













14













-  0

9

- 7













17 - 4 =













19













-  2

17 - 6 =













18 - 9 =













8 - 2 =

19

-  0

15













-  5

11













-  6

12 - 5 =

19

- 6













13 - 7 =













20

- 2













7 - 5 =













17 - 2 =













8

- 7













8 - 8 =













9

- 9













4 - 2 =













18













-  1

12 - 3 =













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