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Twice the sum of x and y decreased by 21
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Twice the sum of x and y decreased by 21

User Robbe
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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.
User Harshay Buradkar
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