Answer:
The answer is (-4x + 15y - 6xy)
Explanation:
(3x + 4y - 3xy + 5x + 3y - 2xy)
= 8x + 7y - 5xy
(2x + y - 3xy + 10x - 9y - 8xy)
= 12x - 8y - 11xy
Now,
(8x + 7y - 5xy) - (12x - 8y - 11xy)
8x + 7y - 5xy - 12x + 8y + 11xy
= -4x + 15y - 6xy
Thus, The answer is (-4x + 15y - 6xy)