medium Set 3 Unknown

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    "title": "form-exercise set 3",
    "operation": "number-sense",
    "subject": "arithmetic",
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            "expression": "8 − (-9)",
            "correctAnswer": "17",
            "question": "8 − (-9) = ?"
        },
        {
            "id": 2,
            "type": "integers",
            "expression": "4 − (-9)",
            "correctAnswer": "13",
            "question": "4 − (-9) = ?"
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            "id": 3,
            "type": "integers",
            "expression": "(-7) − 1",
            "correctAnswer": "-8",
            "question": "(-7) − 1 = ?"
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            "id": 4,
            "type": "integers",
            "expression": "2 − 3",
            "correctAnswer": "-1",
            "question": "2 − 3 = ?"
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            "id": 5,
            "type": "integers",
            "expression": "(-6) − (-4)",
            "correctAnswer": "-2",
            "question": "(-6) − (-4) = ?"
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            "id": 6,
            "type": "integers",
            "expression": "8 − (-6)",
            "correctAnswer": "14",
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            "id": 7,
            "type": "integers",
            "expression": "2 − (-1)",
            "correctAnswer": "3",
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            "id": 8,
            "type": "integers",
            "expression": "(-10) − 8",
            "correctAnswer": "-18",
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            "expression": "(-9) − (-3)",
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            "type": "integers",
            "expression": "2 − 0",
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            "question": "2 − 0 = ?"
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            "id": 12,
            "type": "integers",
            "expression": "(-10) − 0",
            "correctAnswer": "-10",
            "question": "(-10) − 0 = ?"
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            "id": 13,
            "type": "integers",
            "expression": "0 − (-2)",
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            "id": 14,
            "type": "integers",
            "expression": "1 − 0",
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            "expression": "(-4) − 0",
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            "id": 16,
            "type": "integers",
            "expression": "6 − 2",
            "correctAnswer": "4",
            "question": "6 − 2 = ?"
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            "id": 17,
            "type": "integers",
            "expression": "5 − 8",
            "correctAnswer": "-3",
            "question": "5 − 8 = ?"
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            "id": 18,
            "type": "integers",
            "expression": "(-5) − 9",
            "correctAnswer": "-14",
            "question": "(-5) − 9 = ?"
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            "id": 19,
            "type": "integers",
            "expression": "(-9) − 7",
            "correctAnswer": "-16",
            "question": "(-9) − 7 = ?"
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            "id": 20,
            "type": "integers",
            "expression": "4 − 7",
            "correctAnswer": "-3",
            "question": "4 − 7 = ?"
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