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13 March, 17:23

Find a, (x-3) + (x-a) = 15

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  1. 13 March, 20:00
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    a = 2x - 18

    remove the parenthesis and simplify

    x - 3 + x - a = 15

    2x - 3 - a = 18 (add 3 to both sides

    2x - a = 18 (subtract 2x from both sides)

    - a = 18 - 2x (multiply through by - 1)

    a = - 18 + 2x

    a = 2x - 18
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