Factor fully: 8Y(8X-9X)+9(8X-9Z)

To factor fully, we can start by combining like terms:

8Y(8X-9X) + 9(8X-9Z)

Simplifying the expression inside the parentheses:

8Y(-X) + 9(8X-9Z)

Now, we can distribute the 8Y and 9:

-8XY + 72X - 81Z