Triangle L M N is equilateral, and M P bisects L N. L M is 3 x + 1 and M N is 4 x - 2. Find the measure of the side of \triangle L M N.
Choices:
A:9
B:10
C:11
D:12
Please directly answer the question and provide the correct option letter, e.g., A, B, C, D.
Question: Triangle L M N is equilateral, and M P bisects L N. L M is 3 x + 1 and M N is 4 x - 2. Find the measure of the side of \triangle L M N.
Choices:
A:9
B:10
C:11
D:12
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: Triangle L M N is equilateral, and M P bisects L N. L M is 3 x + 1 and M N is 4 x - 2. Find the measure of the side of \triangle L M N.
Choices:
A:9
B:10
C:11
D:12