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用加、减消元法解方程组\(\left\{ {\begin{array}{*{20}{l}} {4x + 3y = 6} \\ {4x - 3y = 2} \end{array}} \right.\)，若先求\(x\)的值，应先将两个方程组相___；若先求\(y\)的值，应先将两个方程组相___。
参考答案：加；减
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