2. Раскрыть скобки.

a) (7-x)*6 = 7*6 - x*6 = 42 - 6x. b) (6a + b)*14 = 6a*14 + b*14 = 84a + 14b. c) 10*(14a - 27b + 5) = 10*14a - 10*27b + 10*5 = 140a - 270b + 50.