Algebra

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Across
  1. 1. v+(-3)=(-10)
  2. 6. 5+k-4
  3. 7. 8=r+4
  4. 8. (-7)+x=(-5)
  5. 10. Large marsupial
  6. 11. Flying mammal
Down
  1. 2. (-16)=(-9)-w
  2. 3. 3+n=7
  3. 4. Has a trunk
  4. 5. Likes to chase mice
  5. 7. 6=2+u
  6. 9. Man's best friend