In triangle A B C, AB = AC. \angle C A B and \angle A B C are both 2 x degrees. A B and B C are 3 and 4 y - 5 inches, respectively. Find x.
Choices:
A:20
B:30
C:40
D:50
Please directly answer the question and provide the correct option letter, e.g., A, B, C, D.
Question: In triangle A B C, AB = AC. \angle C A B and \angle A B C are both 2 x degrees. A B and B C are 3 and 4 y - 5 inches, respectively. Find x.
Choices:
A:20
B:30
C:40
D:50
Please first conduct reasoning, and then answer the question and provide the correct option letter, e.g., A, B, C, D, at the end.
Question: In triangle A B C, AB = AC. \angle C A B and \angle A B C are both 2 x degrees. A B and B C are 3 and 4 y - 5 inches, respectively. Find x.
Choices:
A:20
B:30
C:40
D:50