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Solve the math problem.

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17 - 4 =













8 - 8 =













20

- 2













8 - 2 =

15













-  5

11













-  6

13 - 7 =













17 - 2 =













19













-  2

9

- 9













19

- 6













15













-  1

18













-  1

8

- 7













19

-  0

17 - 6 =













14













-  0

9

- 7













6 - 6 =













12 - 5 =

12 - 3 =













16













-  5

7 - 5 =













18 - 9 =













4 - 2 =













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