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【简答题】
甲、同学同时解关于x、y的方程组 mx+y=3 2x-ny=9 ，甲看错了m，解出的结果是 x= 15 2 y=-3 ；乙看错了n，解出的结果是 x=4 y=-5 ，你能确定m、n的值和原方程组的解吗？
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