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11 May, 01:29

How do i work out 3 (d-4) = 9

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  1. 11 May, 04:16
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    3 (d-4) = 9

    begin by distributing

    (3) (d) + (3) (-4) = 9

    solve right side

    3d + - 12 = 9

    add 12 to both sides

    3d = 21

    divide both sides by 3

    d = 7
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