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Is the product of 9 and twice m translated 9(2m) or 9(m+m)?

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    The two expressions are equivalent, since m+m = 2m

    That said, I'd interpret
    "product of 9 and twice m" as 9(2m)
    "product of 9 and the sum of m and m" as 9(m+m)

    That would leave open the possibility of something like

    "product of 9 and the sum of m and k" as 9(m+k)

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