This is a one step equation. Understanding that we know what he started out with, and what he he had left, we can set it up in two seperate equations. (Easy or Hard version if you prefer, or simple and more complex)
♡EASY♡
$32.00-$23.05= X
X= $8.95
♡"HARDER"♡
$32.00-X=$23.05
Subtract 32 from both sides.
-X=-$8.95
Multiply each side by -1.
-1(-x)=(-$8.95)-1
x=$8.95
Either way, Les spent $8.95 on food.