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=20>>20

Rodney:8(20)-14=146 pounds

# Answer

146
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
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?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
146
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?
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