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The student likely made an error in their evaluation of the expression (-4 + x) when substituting (x = -9) and (x = 12). For (x = -9), the correct calculation should yield (-4 - 9 = -13), and for (x = 12), it should be (-4 + 12 = 8). The result of (5/12) suggests that the student may have miscalculated or misinterpreted the operations involved in evaluating the expression.

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2mo ago

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