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27-09-2016
Mathematics

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Twice the sum of x and y decreased by 21

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JuliaYoungwonKo17 JuliaYoungwonKo17

27-09-2016

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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