
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
Given: $a$ and $b$ are opposite numbers, $c$ and $d$ are reciprocals, $x$ is a number with a distance of $4$ from the origin, $|y|=6$, and $y \lt 0$. Find: (1) $a+b=$______, $cd=$______, $x=$______, $y=$______; (2) Find the value of $2x-cd+4(a+b)-y^{2}$.

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