Answer:
x = 7
Explanation:
We can identify the figure formed by 2 radii, (6x - 3), and (3x + 18) as a kite because it is a quadrilateral symmetric around a center line.
The radii sides are congruent, and therefore, the other two sides must be congruent as well. So, we can solve for x by equation (6x - 3) and (3x + 18).

↓ subtracting 3x from both sides

↓ adding 3 to both sides


↓ dividing both sides by 3
