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15 November, 15:02

The sum of 2, three times a number, - 9, and four times the number

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  1. 15 November, 15:50
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    Sum means add

    let's say the number is n

    3 times a number is 3n

    4 times the number is 4n

    so

    sum of 2 and 3 times a number and - 9 and 4 times the number means

    2+3n-9+4n or

    3n+4n+2-9 or

    7n-7
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