Jennifer claims that the solution to 3(3x + 9) - 2x = 4x is x = -9. She shows the work below to justify her claim. Select all the justifications that are correct.

Adepartment store purchases screen-printed t-shirts at a cost of $5 per shirt. they mark up the price 150% (making the selling price 250% of the store's purchase price) and put them on the sales floor. every month that a t-shirt doesn't sell, the store reduces the selling price by 25%.