Simplify 9x + 3y − 6 − 5x + 4y −3

Simplifying the expression 9x + 3y - 6 - 5x + 4y - 3, we first combine like terms:

(9x - 5x) + (3y + 4y) + (-6 - 3)

This simplifies to:

4x + 7y - 9