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Solve the math problem.

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14













-  0

19

-  0

17 - 2 =













15













-  5

12 - 3 =













6 - 6 =













18













-  1

7 - 5 =













9

- 7













12 - 5 =

11













-  6

4 - 2 =













13 - 7 =













8 - 8 =













15













-  1

17 - 6 =













16













-  5

9

- 9













8

- 7













20

- 2













8 - 2 =

17 - 4 =













19

- 6













19













-  2

18 - 9 =













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