
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
Triangle $DEF$ is positioned at vertices $D(2, 1)$, $E(-3, -4)$, and $F(5, -2)$. Reflect triangle $DEF$ over the x-axis to form triangle $D'E'F'$. What is the length of a segment drawn from $D$ to $D'$?

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