
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
The master and apprentice together make a total of 40 parts per hour. In the same amount of time, the master made 300 parts and the apprentice made 100 parts. If the number of parts the master makes per hour is denoted as $x$, set up an equation.

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