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20 November, 17:35

How to solve 3n+9=7n-15

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Answers (2)
  1. 20 November, 18:14
    0
    Simplifying 3n + 9 = 7n + - 15

    9 + 3n = 7n + - 15

    9 + 3n = - 15 + 7n

    9 + 3n = - 15 + 7n

    9 + 3n + - 7n = - 15 + 7n + - 7n

    3n + - 7n = - 4n 9 + - 4n = - 15 + 7n + - 7n

    7n + - 7n = 0 9 + - 4n = - 15 + 0 9 + - 4n = - 15

    9 + - 9 + - 4n = - 15 + - 9

    9 + - 9 = 0 0 + - 4n = - 15 + - 9 - 4n = - 15 + - 9

    -15 + - 9 = - 24 - 4n = - 24

    Divide each side by - 4

    n = 6
  2. 20 November, 20:50
    0
    The answer to this problem is 6
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