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若直线\({l_1}\)：\(\left( {a + 2} \right)x + \left( {1 - a} \right)y - 3 = 0\)与\({l_2}\)：\(\left( {a - 1} \right)x + \left( {2a + 3} \right)y + 2 = 0\)互相垂直，则\(a\)的值为___
参考答案：\(a = \pm 1\)
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