curl --request POST \
  --url https://api.iotools.cloud/v1/tool/absolute-value-equation-solver \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "a": "2",
  "b": "3",
  "c": "7"
}
'

{
  "tool": "absolute-value-equation-solver",
  "tool_version": "1.0.2",
  "outputs": {
    "status": "two_solutions",
    "solution": "x = 2 or x = -5",
    "steps": "Equation: |2x + 3| = 7\nc ≥ 0, so split into two cases: 2x + 3 = 7, or 2x + 3 = -7\nCase 1: 2x + 3 = 7 → x = (7 - 3) / 2 = 2\nCase 2: 2x + 3 = -7 → x = (-7 - 3) / 2 = -5"
  },
  "credits_used": 5,
  "credits_remaining": null
}