I don’t understand how to do this problem 3x + y =9

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I don’t understand how to do this problem 3x + y =9

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Nem 5 months 2021-08-22T14:40:06+00:00 1 Answers 1 views 0

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    2021-08-22T14:41:47+00:00

    Answer:

    35

    Step-by-step explanation:

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Giải phương trình 1 ẩn: x + 2 - 2(x + 1) = -x . Hỏi x = ? ( )