The perimeter of the front face of a prism is 88 feet. The side lengths of the front face are 2x feet, (4x+8) feet, 2x feet, and (4x+8) feet. What is the value of x?

2x + 4x + 8 +2x +4x + 8 = 88

12x +16 = 88 | -16

12x = 72 | :12

x = 6