
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
Suppose you have symbols $\triangle$ and $\square$ that follow these balance rules: 
1. Five $\triangle$'s and two $\square$'s will balance twenty-one $\bigcirc$'s. 
2. Two $\triangle$'s balance one $\square$ and three $\bigcirc$'s.

How many $\bigcirc$'s will balance three $\square$'s in this balance system?
A) 5
B) 7
C) 9
D) 11
E) 13

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