
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
Find the value of $b$ such that the following equation in base $b$ is true:
$$\begin{array}{c@{}c@{}c@{}c@{}c@{}c@{}c}
&&8&7&3&6&4_b\\
&+&9&2&4&1&7_b\\
\cline{2-7}
&1&8&5&8&7&1_b.
\end{array}$$

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