curl --request POST \
  --url https://api.iotools.cloud/v1/tool/linear-equation-solver \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "a": "2",
  "b": "3",
  "c": "11"
}
'

{
  "tool": "linear-equation-solver",
  "tool_version": "1.0.2",
  "outputs": {
    "status": "one_solution",
    "solution": "x = 4",
    "exactFraction": "4",
    "steps": "Equation: 2x + 3 = 11\nSubtract b from both sides: 2x = 11 - 3 = 8\nDivide both sides by a: x = 8 / 2 = 4"
  },
  "credits_used": 5,
  "credits_remaining": null
}