809. Выберите равносильные уравнения: 1) |у + 2 = 7 и (у - 5)(у + 9) = 0; 2) 2y + 5 = 3 и (у + 1)(у + 4) = 0; 3) |5x −11| = 4 n (x – 8)(x – 3) = 0; - 4) |8x| = 2 и (x-6)(x - 10) = 0.​
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