Number Sense Integers Integer Subtraction — Set 2

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            "type": "integers",
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            "type": "integers",
            "expression": "6 − 1",
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            "type": "integers",
            "expression": "4 − (-5)",
            "correctAnswer": "9",
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            "type": "integers",
            "expression": "5 − (-4)",
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            "type": "integers",
            "expression": "(-4) − 5",
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