Algebra

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Across
  1. 3. mathematical statement containing a =
  2. 4. positive and negative numbers
  3. 6. number in front of a variable
  4. 7. mark or sign standing for something else
Down
  1. 1. unkown placeholder in an algebraic expression
  2. 2. sum or difference of terms
  3. 5. numbers, variables or variables with numbers