The sum of a number and twelve is twenty-one. What is the number? 21 n 12 8 9 10 33

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The sum of a number and twelve is twenty-one. What is the number? 21 n 12 8 9 10 33

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Ngọc Diệp 4 years 2021-07-22T05:12:05+00:00 2 Answers 21 views 0

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  1. nguyetanh
    0
    2021-07-22T05:13:20+00:00
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    Answer:

    9

    Step-by-step explanation:

    Subtract 1 2 12 12 from both sides of the equation + 1 2 = 2 1 + 1 2 − 1 2 = 2 1 − 1 2 2 Simplify Solution = 9

  2. Eirian
    0
    2021-07-22T05:13:48+00:00
    Reply

    Answer:

    9+12=21

    Step-by-step explanation:

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