
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
Cecilia is solving two quadratic equations simultaneously. The first equation is $9x^2 - 36x - 81 = 0$. She wants to solve it by completing the square. In addition, she is also considering the equation $y^2 + 6y + 9 = 0$. Find the values of $x + y$.

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