Ответ:

  1. \(x:18=28\); \(x=28\cdot18=504\).
  2. \(228:x=12\); \(x=228:12=19\).
  3. \((x-3):4=6\); \(x-3=24\); \(x=27\).
  4. \(x:4-8=6\); \(x:4=14\); \(x=56\).
  5. \(36:(x-2)=4\); \(x-2=9\); \(x=11\).
  6. \(36:x-2=4\); \(36:x=6\); \(x=6\).