Expanding brackets

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Across
  1. 2. Answer from multiplying
  2. 5. Letter that can change value
  3. 7. Make expression as simple as possible
  4. 8. Maths statement with letters and numbers
  5. 9. Part of an algebra expression
  6. 10. Times number by each term
Down
  1. 1. Multiply everything inside brackets
  2. 3. Number in front of a letter
  3. 4. Grouped part of an expression
  4. 6. Multiply bracket out