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30 May, 17:50

Seven times the difference of 9 and a number amounts to 84. Find the number.

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  1. 30 May, 21:12
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    7 * (n-9) = 84

    7n - 63 = 84

    7n = 147

    /n / n

    n = 21

    Therefore the number is 21.

    Proof:

    7 * (21-9) = 84

    7 * 12 = 84

    84 = 84
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