Function Machine Subtraction Hard — Set 11

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                "input": 5,
                "output": 4,
                "question": "Input: 5 → [-1] → ?",
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                "input": 2,
                "output": 4,
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                "id": 4,
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                "input": 2,
                "output": 12,
                "question": "? → [+4 ×2] → 12",
                "answer": 2,
                "correctAnswer": "2",
                "difficulty": "hard"
            },
            {
                "id": 5,
                "type": "function-machine",
                "subType": "find-rule",
                "rule": "-3",
                "input": 10,
                "output": 7,
                "question": "Input: 10 → [?] → 7, what is the rule?",
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                "correctAnswer": "-3",
                "difficulty": "hard"
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                "id": 6,
                "type": "function-machine",
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                "question": "Input: 2 → [+4 ×2] → ?",
                "answer": 12,
                "correctAnswer": "12",
                "difficulty": "hard"
            },
            {
                "id": 7,
                "type": "function-machine",
                "subType": "find-input",
                "rule": "+10",
                "input": 3,
                "output": 13,
                "question": "? → [+10] → 13",
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                "correctAnswer": "3",
                "difficulty": "hard"
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                "id": 8,
                "type": "function-machine",
                "subType": "find-input",
                "rule": "+2",
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                "question": "? → [+2] → 12",
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    "_archetype": "form-exercise",
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