Algebra

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Across
  1. 4. 1 + x = 20
  2. 6. x - 4 = 6
  3. 7. 2 + x = 3
Down
  1. 1. 11 + x = 16
  2. 2. 15 - x = 7
  3. 3. x + 2 = 9
  4. 5. 6 + x = 15