Subtract:8x - 14 xy + 6y + 24 from 12x - 9xy + 5y - 6.

Solution:

12x - 9xy + 5y - 6 - (8x - 14 xy + 6y + 24)
= 12x - 9xy + 5y - 6 - 8x + 14xy - 6y - 24
= 4x + 5xy - y - 30