Раскройте скобки:

- 3(a + b + c) = -3a - 3b - 3c

3(2 - a) = -3a + 6
6 -3a = -3a + 6

2(x +4) - 5 = 2x + 8 - 5 = 2x + 3
3(y - 1) - 8 = 3y - 3 - 8 = 3y - 11

15 + (a + b) = 15 + a + b
6 - (c - d) = 6 - c + d

(20 + x) + 10 = 20 + x + 10 = x + 30
30 - (x + 3) = 30 - x  - 3 = -x + 27