Algebra crossword

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Across
  1. 1. A letter used to represent an unknown number
  2. 6. The process of taking something away
  3. 9. A symbol that shows an operation
  4. 10. An expression that divides another number
  5. 11. Two expressions separated by an equal sign
  6. 13. The process of adding something
  7. 15. To find an answer
  8. 16. The act of adding something to itself a certain amount of times
  9. 17. The number that comes before a variable
  10. 19. This indicates how many times the number should be multiplied by itself
Down
  1. 2. A mathematical phrase with various numbers
  2. 3. The action of separating something into parts
  3. 4. This represents a part of a whole
  4. 5. A non-changing mathematical symbol
  5. 7. Moving numbers without making any difference
  6. 8. Reducing to a simpler form
  7. 12. Difference in circumstances
  8. 13. When moving parentheses doesn't change the equation
  9. 14. A whole number, not a fraction
  10. 18. Extending to a nearly straight line