Algebraic terms

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Across
  1. 1. A result of multiplication
  2. 5. Two expression made withequal
  3. 6. A result of addition
  4. 7. A result of subtraction
Down
  1. 1. Symbol of addition
  2. 2. An amoumt that do not change
  3. 3. Symbol of subtraction
  4. 4. A value for satisfy the equation