
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
Find the largest real number \(\lambda\) such that for the real coefficient polynomial \(f(x) = x^3 + ax^2 + bx + c\) with all non-negative real roots, it holds that \(f(x) \geqslant \lambda(x - a)^3\) for all \(x \geqslant 0\). Additionally, determine when the equality in the expression is achieved.

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