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2 9 4 б. 4a-3b+5a-2b. 7а+2б=9 3а+б=-1. 4a - 3b : 3a + 4b. (3a-4b)(a+b)=3a².
4a-3b+5a-2b. 7а+2б=9 3а+б=-1. 4a - 3b : 3a + 4b. (3a-4b)(a+b)=3a².

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