A) (4x - 3y + 13) + (7x + 8y - 6) + (2y - 5 - 8x) =b) (5x - 3y + 1) + (2y - x - 7) + (12 + 6y - 15x) =c) (a + 10b - g) + (3a - 5b + 4c) + (2c + b - 6) =d) (8xy - 2yz) + (2xy - z + 6yz) + (9yz - 7yz - ?
A) (4x - 3y + 13) + (7x + 8y - 6) + (2y - 5 - 8x) = b) (5x - 3y + 1) + (2y - x - 7) + (12 + 6y - 15x) = c) (a + 10b - g) + (3a - 5b + 4c) + (2c + b - 6) = d) (8xy - 2yz) + (2xy - z + 6yz) + (9yz - 7yz - 3z) =.