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8 October, 17:20

A number no decreased by the difference between seven and the number

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  1. 8 October, 20:04
    0
    2a-7

    Step-by-step explanation:

    say our number is a

    a - (7-a)

    get rid of the perenthesis

    a-7+a

    put the variables on one side

    a+a-7

    so the answer is 2a-7
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