Final answer:
The value of x in the isosceles trapezoid is 3.
Step-by-step explanation:
In an isosceles trapezoid, the bases have the same length. Let's label the bases as WB and RH, and their respective expressions as 5x - 3 and 2x + 6. Since the trapezoid is isosceles, WB and RH are equal, so we can set them equal to each other:
5x - 3 = 2x + 6
Next, we can solve for x:
5x - 2x = 6 + 3
3x = 9
x = 3
Therefore, the value of x in the isosceles trapezoid is 3.