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Solve the math problem.

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12 - 3 =













18 - 9 =













15













-  1

17 - 6 =













6 - 6 =













7 - 5 =













9

- 7













17 - 2 =













8 - 8 =













8 - 2 =

16













-  5

14













-  0

13 - 7 =













4 - 2 =













18













-  1

20

- 2













19

-  0

17 - 4 =













9

- 9













19













-  2

8

- 7













12 - 5 =

15













-  5

19

- 6













11













-  6

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