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31 December, 07:13

Twice the sum of x and y decreased by 21

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  1. 31 December, 08:24
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    Answer: 2 ((x+y) - 21)

    Calculation/Explanation:

    Twice the sum of x and y decreased by 21 means that you must add x and y first before decreasing by 21. The last step is to double the whole equation that we just performed.
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