c

1234567
Across
  1. 2. 2X+7-2=399
  2. 3. X/4+4+40=69
  3. 5. X-1-1-1=7
  4. 6. X/2+524==213=5099
  5. 7. (4X-16)/20+18=23
Down
  1. 1. 4X/2+7=706=699
  2. 2. X+7-7-7=993
  3. 4. (8X4+896-900)+123=3785
  4. 5. (X/12-18)+6=-11