Answer :

[tex]5(9-3)=w\cdot9-5\cdot3\\ 45-15=9w-15\\ 9w=45\\ w=5[/tex]
use * as multiplication symbol
5(9 - 3) = w * 9 - 5 * 3
Let's simply the equation
5(6) = 9w - 15
30 = 9w - 15
Add 15 to both sides
45 = 9w
w = 5