In order to simplify this equation, there are a few things that need to be done. You need to solve for x first by simplifying both sides of the equation. You then need to isolate the variable. After you do that you get:
Step by step explanation: Since they took the price down 29% multiply the price by 1.29 to add the 29 percent back to the total amount. 428.84 * 1.29 = 553.20