раскройте скобки- 4(a+2); 3(m-5); (p-q)*9; 12(a+b); 5(2m-1); (3c+5d)*14.
4(а+2) = 4а+8
3(m-5) = 3m-15
(p-q)*9 = 9p - 9q
12(a+b) = 12a + 12b
5(2m-1) = 10m - 5
(3c+5d)*14 = 42c + 70d