```json
[
{"q": "a - 8 = 7", "a": "a = 15"},
{"q": "17 - a = 9", "a": "a = 8"},
{"q": "c - 50 = 50", "a": "c = 100"},
{"q": "b - 75 = 25", "a": "b = 100"},
{"q": "a + 40 = 100", "a": "a = 60"},
{"q": "97 + c = 98", "a": "c = 1"},
{"q": "18 + b = 30", "a": "b = 12"},
{"q": "100 - y = 90", "a": "y = 10"},
{"q": "63 - c = 0", "a": "c = 63"},
{"q": "b + 7 = 23", "a": "b = 16"},
{"q": "x - 75 = 100", "a": "x = 175"},
{"q": "x - 12 = 22", "a": "x = 34"}
]
```