Margot is sewing a ribbon on a seam along the perimeter of a square pillow. The side length of the pillow is 2 x squared plus 1 inches. She plans to make a similar pillow, including the ribbon, whose side length is 4 x minus 7 inches. What expression can be used for the length of ribbon that she needs for both pillows, and what is the length if x is equal to 3 point 5 ?