
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
In parallelogram $ABCD$, it is known that the lengths of sides $AB$, $BC$, and $CD$ are $(x+3)cm$, $(x-4)cm$, and $16cm$, respectively. Then, $AD=$ ______.

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