Equation Crossword Puzzle

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Across
  1. 4. reverse a calculation of operations
  2. 5. can be solved in two steps with inverse operations
  3. 7. the number is multiplied by the variable
  4. 8. combining two or more numbers to make a total
  5. 12. does not have the same variable
  6. 17. the letter like x or y
  7. 18. smaller than another
  8. 19. a value that can't be changed
  9. 20. multiplying the inside numbers by the outside number
Down
  1. 1. has many steps like distributing and inverse operations
  2. 2. has a larger value
  3. 3. can be solved in one step with inverse operations
  4. 6. expressions that are connected by a equal sign
  5. 9. a short story with the problem
  6. 10. has the same variable
  7. 11. times by a number
  8. 13. rewriting an expression to become shorter
  9. 14. a mix of numbers and symbols with no equal sign
  10. 15. the difference in number by amounts
  11. 16. cutting numbers in half to find a equal group