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Andrew [12]
3 years ago
9

Twice the sum of x and y decreased by 21

Mathematics
1 answer:
Semenov [28]3 years ago
8 0
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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