Задание 1. Вынесите общий множитель за скобки:

а) 8a + 8b = 8(a + b);

б) 20y³ – 12y² = 4y²(5y – 3);

в) – 3b(b – 2) + 7(b – 2) = (b - 2)(- 3b + 7).
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