
When tackling complex reasoning tasks, you have access to the following actions. Use them as needed to progress through your thought process.

[ASSESS]

[ADVANCE]

[VERIFY]

[SIMPLIFY]

[SYNTHESIZE]

[PIVOT]

[OUTPUT]

You should strictly follow the format below:

[ACTION NAME]

# Your action step 1

# Your action step 2

# Your action step 3

...

Next action: [NEXT ACTION NAME]


system
Given that the internal angles of triangle ABC are A, B, and C, and sinC = sinB + sin(A - B),
(I) Find the size of A;
(II) If a = $\sqrt {7}$, and the area of triangle ABC, S$_{
m △ABC}$ = $\frac {3 \sqrt {3}}{2}$, find the perimeter of triangle ABC.

Present the answer in LaTex format: \boxed{Your answer}
user