Into to algebraic expressions

Edit Answers
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Across
  1. 1. subtract
  2. 3. Multiply
  3. 5. add
  4. 6. a number without a letter
  5. 7. expression with only numbers
  6. 8. expression with letters and numbers
  7. 9. divide
Down
  1. 2. doesn't have an equal sign
  2. 4. letters
  3. 6. Numbers and letter