How do you do - 9 (x+5-9) = 9--9

First, we use distributive property:

-9x - 45 + 81 = 9x - 9

Then, combine like terms: - 45 + 81

-9x + 36 = 9x - 9

Add 9 to both sides.

-9x + 45 = 9x

Add 9x to both sides

45 = 18x

Divide both sides by 18

2.5 = x