conversations.from: human
conversations.value: I'm completely lost with this math problem: John's pool is 5 feet deeper than 2 times Sarah’s pool. If John’s pool is 15 feet deep, how deep is Sarah’s pool?
  Can you give me a hand?
conversations.from: assistant
conversations.value: Let x be the number of feet in John’s pool
  2*x + 5=15
  2x=10
  x=5