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7 October, 08:51

4 (5x2 - 9x + 7) + 2 (-10x2 + 18x - 13)

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  1. 7 October, 09:11
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    4 (10-9x+7) + 2 (-20+18x-13)

    4 (17-9x) + 2 (18x-33)

    68-36x+36x-66

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