Identify the value of x and the length of each chord. The figure shows a circle. Points A, B, C, D lie on the circle. Chords A B and C D intersect at point E. The length of segment A E is 7 units. The length of segment E B is 18 units. The length of segment E D is 21 units. The length of segment C E is x units.

x = 6; AB = 27; CD = 25
x = 16; AB = 25; CD = 37
x = 6; AB = 25; CD = 27
x = 16; AB = 37; CD = 25
Please help quickly!