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25 November, 06:24

9 (2a - b) 2 - 4 (2a - b) - 13

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  1. 25 November, 10:06
    0
    18 (2a-b) - 4 (2a-b) - 13

    =36a-18b-8a+4b-13

    Rearrange

    =36a-8a-18b+4b-13

    =28a-14b-13
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