
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
The function f(x) is an odd function defined on R, and for any x∈R, it satisfies f(x+1) + f(x) = 0. When 0 < x < 1, f(x) = 3^(x+1). Find f(log₃18) + f(4) = _____.

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