Tìm m và n để hai hệ phương trình sau tương đương : {𝑥 − 3𝑦 = −1 2𝑥 + 3𝑦 = 7 và {2𝑚𝑥 + 5𝑦 = 1 −2𝑥 + 𝑛𝑦 = 4 Cần gấp 🙏🙏🙏

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