Algebra Crossword puzzle

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Across
  1. 4. Always true no matter what values are substituted
  2. 5. Contains unknown value but no equals sign.
  3. 6. Links one value to one or more other value.
  4. 7. Is a value or number that never changes in expression
Down
  1. 1. Contains unknowns and can be solved.
  2. 2. The terms that contain the same variable which is raised to the same power
  3. 3. An alphabet which is used to represent the unknown number