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Across
  1. 1. 5a-12a+6
  2. 3. 2+8x-5+2x
  3. 5. 9x+4x-9
  4. 6. 8-4b-9b
  5. 7. 3x-9x
  6. 8. 10+6a-6
  7. 9. 12y-8y
  8. 11. 9y+5+3y
  9. 12. (-4a)+9a
Down
  1. 1. 7x+8-9x
  2. 2. (-12b)-5b
  3. 4. 10b-6y-7b-2y
  4. 5. 8x+2x
  5. 6. 5x-9x-8y +7y
  6. 9. 10a-5-6a
  7. 10. 5y+6+4y-2