Verified answer

Пошаговое объяснение:

17 - (5х - 4у + z) = 17 - 5x + 4y - z

y + (5x - 7z) = y + 5x - 7z

-(x - 8) - (2y - 5) = -x + 8 - 2y + 5 = -x - 2y + 13

-(2a + b) + (3a - 7) = -2a - b + 3a - 7 = a - b - 7