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10 October, 16:23

If you add 7 to a number, multiply the sum by 3, and subtract 47 from the product, you will get the number you started with. What is the number?

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  1. 10 October, 16:40
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    The number is 13.

    we can calculate this as;

    let x is the number

    ((x + 7) x 3) - 47) = x

    (3x + 21) - 47 = x

    3x + 21 - x = 47

    2x + 21 = 47

    2x = 47 - 21

    2x = 26

    x = 26/2

    x = 13
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