Final answer:
There is no specific value of x for which the perimeters of the two designs are equal.
Step-by-step explanation:
To find the value of x for which the perimeters of the two designs are equal, we can start by simplifying the equation. Distribute on the left side of the equation to get 8x + 12 = 2x - 2 + 6x + 14. Combine like terms on both sides to get 8x + 12 = 8x + 12. This means that the equation is always true, regardless of the value of x. Therefore, there is no specific value of x for which the perimeters of the two designs are equal.