conversations.from: human
conversations.value: Please show me the solution for: Rodney, Roger and Ron can lift a combined weight of 239 pounds.  Rodney can lift twice as much as Roger, and Roger can lift 7 pounds less than 4 times the amount that Ron can lift.  How much can Rodney lift?
conversations.from: assistant
conversations.value: Let x represent the amount that Ron can lift.
  Roger: 4x-7
  Rodney:2(4x-7)=8x-14
  Total:x+4x-7+8x-14=239
  13x-21=239
  13x=260
  x=20
  Rodney:8(20)-14=146 pounds