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关于\(x\)的方程组\(\left\{ {\begin{array}{*{20}{l}} {3x - y = m} \\ {x + my = n} \end{array}} \right.\)的解是\(\left\{ {\begin{array}{*{20}{l}} {x = 1} \\ {y = 1} \end{array}} \right.\)，则\(|m - n|\)的值是___．
参考答案：1
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