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Solve the math problem.

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12 - 3 =













6 - 6 =













15













-  5

12 - 5 =

19

- 6













13 - 7 =













15













-  1

19

-  0

17 - 6 =













18













-  1

20

- 2













11













-  6

17 - 4 =













8 - 2 =

19













-  2

8 - 8 =













7 - 5 =













4 - 2 =













8

- 7













18 - 9 =













9

- 9













16













-  5

9

- 7













14













-  0

17 - 2 =













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