1. **State the problem:** You want to find the length of one side of a rectangle when you know the area and the length of the other side. 2. **Formula:** The area $A$ of a rectangle is given by the formula: $$A = \text{length} \times \text{width}$$ 3. **Given:** You know $A$ (area) and one side, say the length $l$. 4. **Find:** The other side, the width $w$. 5. **Rearrange the formula to solve for $w$:** $$w = \frac{A}{l}$$ 6. **Important rule:** When dividing both sides by $l$, make sure $l \neq 0$ because division by zero is undefined. 7. **Example:** If the area is 24 and the length is 6, then: $$w = \frac{24}{6} = 4$$ 8. **Conclusion:** The width is 4 units. This method works for any rectangle when you know the area and one side length.