Algebra - Key words

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Across
  1. 1. Letters in algebra are also known as
  2. 3. Branch of mathematics that includes numbers and letters
  3. 7. remaining factors of the term
  4. 8. Term without variable
  5. 9. Letters used in algebra
Down
  1. 2. Equality of two expressions
  2. 4. A collection of terms
  3. 5. Numbers used in algebra
  4. 6. A combination of constant and variable by multiplication or division