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11 April, 23:03

4. (-x 4 + 13x 5 + 6x 3) + (6x 3 + 5x 5 + 7x4)

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  1. 12 April, 02:04
    0
    140

    Step-by-step explanation:

    = (-4+55+18) + (18+25+28)

    =69+71

    =140
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