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Solve the math problem.

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12 - 3 =













9

- 7













18 - 9 =













11













-  6

14













-  0

15













-  1

13 - 7 =













19













-  2

6 - 6 =













8 - 8 =













7 - 5 =













18













-  1

17 - 4 =













8 - 2 =

9

- 9













20

- 2













19

-  0

15













-  5

19

- 6













16













-  5

17 - 2 =













8

- 7













12 - 5 =

17 - 6 =













4 - 2 =













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