To solve for $x$ given that lines $l$ and $m$ are parallel ($l \parallel m$), we need more information about the specific relationship between $x$ and the lines $l$ and $m$. Parallel lines usually imply congruent corresponding angles, supplementary consecutive interior angles, or other geometric relationships, depending on the context.

If you have an equation or geometric diagram, please provide it so I can assist you further. Without additional details, I can only give a general response about parallel lines.

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Here are five related questions that might interest you:

1. What are the corresponding angles when two lines are parallel?
2. How do you find the slope of a line parallel to a given line?
3. What is the relationship between alternate interior angles in parallel lines?
4. How do you prove that two lines are parallel using algebra?
5. Can two lines be parallel if their slopes are not equal?

Tip: When working with parallel lines, always remember that the angles formed by a transversal are key to solving most problems involving them.