{
  "question_id": 5118,
  "hints": [
    {
      "hint_level": 1,
      "hint": "Group the x terms: 7x - 5x."
    },
    {
      "hint_level": 2,
      "hint": "Group the numbers: 6 - 4."
    },
    {
      "hint_level": 3,
      "hint": "Combine: 2x + 2."
    }
  ]
}