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求 x, y 使 {{ 2x, 3 }, {5, y+1 }} = {{ 8, 3 }, {5, 7 }} 。（答：。）
求 x, y 使 {{ 2x, 3 }, {5, y+1 }} = {{ 8, 3 }, {5, 7 }} 。（答：。）
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