1)
-12 + 4x + 4y - 69 + y - 8y
= -12 - 69 + 4x + 4y + y - 8y
= -81 + 4x - 3y
2)
Suppose you meant (4 / 3x) - (8 / 3y) + (1 / 3). We have:
(4 / 3x) - (8 / 3y) + (1 / 3)
= (4y / 3xy) - (8x / 3xy) + (xy / 3xy)
= (4y - 8x + xy) / (3xy)
Suppose you meant (4/3)x - (8/3)y + (1/3) instead. We have:
(4/3)x - (8/3)y + (1/3)
= (1/3)(4x) - (1/3)(8y) + (1/3)(1)
= (1/3)(4x - 8y + 1)