Ответ:
2а(3а-5)-(а-3)(а-7)
6а²-10а-(а²-7а+3а+21)
6а²-10а-а²+4а-21
5а²-6а-21
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Ответ:
2а(3а-5)-(а-3)(а-7)
6а²-10а-(а²-7а+3а+21)
6а²-10а-а²+4а-21
5а²-6а-21