conversations.from: human
conversations.value: A quarterback throws 50 passes in one game.  He throws twice as many passes to the right of the field than he does to the left of the field.  He throws 2 more passes to the center of the field than he did to the left.  How many passes did he throw to the left side of the field?
conversations.from: assistant
conversations.value: Let x represent the number of passes thrown to the left side of the field
  Right:2x
  Center:x+2
  Total:x+2x+x+2=50
  4x+2=50
  4x=48
  x=12 passes