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2 February, 12:39

If the sum of a number and seven is doubled, the result is one less than the number. find the number

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  1. 2 February, 16:36
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    (n + 7) 2 = n - 1

    2n + 14 = n - 1

    2n - n + 14 = n - n - 1

    n + 14 - 14 = - 1 - 14

    n = - 15

    (-15 + 7) 2 = - 15 - 1

    (-8) 2 = - 16

    -16 = - 16
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