
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
Babies aged 1 to 6 months grow very quickly. The relationship between their weight $y$ (in grams) and age in months $x$ can be approximated by $y = a + 800x$, where $a$ is the baby's weight at birth. If a certain baby's weight at birth is 3200 grams, then when the weight is 7200 grams, the age $x$ is ______.

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