
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
In parallelogram $LMNO$, the length of $MN$ is $15$ units. A line perpendicular to $MN$ represents an altitude from vertex $O$ to $MN$ and measures $9$ units. Another altitude from vertex $N$ to side $LO$ measures $7$ units. Determine the length of $LO$.
A) $18$ units
B) $19$ units
C) $19\frac{2}{7}$ units
D) $20$ units

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