
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
In $\triangle ABC$, the sides opposite to angles $A$, $B$, and $C$ are $a$, $b$, and $c$, respectively. Given that $2b(2b-c)\cos A=a^2+b^2-c^2$.
(I) Find the measure of angle $A$;
(II) If the area of $\triangle ABC$ is $S_{\triangle ABC}= \frac {25 \sqrt {3}}{4}$, and $a=5$, find $b+c$.

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