addition and subtraction

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Across
  1. 1. 15-5
  2. 3. 9-3
  3. 6. 10+10
  4. 9. 6+5
  5. 10. 8+7
  6. 11. 9+9
Down
  1. 1. 5+8
  2. 2. 1+12
  3. 4. 10 + 9
  4. 5. 4+3
  5. 7. 8-7
  6. 8. 12-3
  7. 12. 10 - 8