Answer:
x = 5 units
Explanation:
The area of a rectangle equals length times widths, therefore we can use the information from the question to make the following equation...
108 = (2x + 8)(6)
Now we just solve the equation and get...
108 = (2x + 8)(6)
108 = 12x + 48
12x = 108 - 48
12x = 60
x = 60 / 12
x = 5
Therefore, x = 5 units.