二元一次方程组\(\left\{ {\begin{array}{*{20}{l}} {x - y =

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二元一次方程组\(\left\{ {\begin{array}{*{20}{l}} {x - y = - 3} \\ {2x + y = 0} \end{array}} \right.\)的解是___。

参考答案：\(\left\{ {\begin{array}{*{20}{l}} {x = - 1} \\ {y = 2} \end{array}} \right.\)