Verified answer

1). -3(y + 2) + 2(2y - 1) = -3y - 6 + 4y - 2= y - 8;

2). 8x - (2x + 5) + (x - 1) = 8x - 2x - 5 + x - 1 = 7x - 6;

3). 13b - 19b - (8b - (6 - b)) = 13b - 19b - 8b + 6 - b = -15b + 6;