
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
A large rectangle has area 168 square units and is divided into four rectangles by two segments, with one segment parallel to the width and the other not necessarily parallel to the length. Given three of these resulting rectangles have areas 33, 45, and 20, find the area of the fourth rectangle.

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