266. Спростіть вираз:
1) 5(3 - 2а) + 7(3а - 1);
3) Зm(m - 2) - 5m(7 - т);
2) 3(2х - 8) - 3(2х - 5);
4) 2а (3а - 5) + 4а (а + 3).​
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