1) a) 3b + (5a - 7b) = 3b + 5a - 7b = 5a + (3-7)b = 5a - 4b
Ответ: $$5a - 4b$$
б) -3q - (8p - 3q) = -3q - 8p + 3q = (-3+3)q - 8p = 0q - 8p = -8p
Ответ: $$-8p$$