Column addition and subtraction

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Across
  1. 2. 1452-231
  2. 3. 412+215+68+7
  3. 5. 1437+258
  4. 8. 5163+2974
  5. 9. 1+21+321+4321
Down
  1. 1. 2680-459
  2. 2. 871+209+310
  3. 4. 5163-2974
  4. 6. 325+263
  5. 7. 4000-1276