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Solve the math problem.

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18













-  1

16













-  5

17 - 2 =













6 - 6 =













12 - 5 =

19













-  2

13 - 7 =













8 - 8 =













11













-  6

9

- 9













12 - 3 =













18 - 9 =













14













-  0

17 - 4 =













4 - 2 =













19

-  0

7 - 5 =













17 - 6 =













20

- 2













15













-  1

19

- 6













9

- 7













8

- 7













8 - 2 =

15













-  5

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