conversations.from: human
conversations.value: I need a clearer understanding of how to solve: If I give my brother 2 marbles I will have double his number of marbles, but my friend will have triple the number I do. The total number of marbles we have together is 63. How many marbles do I have?
conversations.from: assistant
conversations.value: Let X be the number of marbles I have.
  If I give my brother 2 marbles, I'll have X-2 marbles left.
  And my brother will have (X-2)/2 marbles.
  And my friend will have (X-2)*3 left.
  So the total number of marbles is X-2 + (X-2)/2 + (X-2)*3 = 63.
  (X-2)*9/2 = 63.
  X-2 = 14.
  X = 16 marbles.