An antique Persian carpet has an area of (x^2 + x - 20) ft^2 and a length of (x + 5) feet. The rug is displayed on a wall in a museum. The wall has a width of (x + 2) feet and an area of (x^2 + 17x + 30) ft^2. Write expressions for the length and width of both the rug and wall. Then find the dimensions of the rug and the wall if x = 20 feet.