Negative and Postive Integer

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Across
  1. 5. (-30)+8
  2. 8. 4(-1+2)
Down
  1. 1. 8+(-3)
  2. 2. 13+(-6)+12
  3. 3. 15-6+(-3)
  4. 4. (-5)+11-4
  5. 6. -26+26+36
  6. 7. (-6)+3-5
  7. 9. 7-(-4)