The equation you have is $3x = 15$.

To solve for $x$, divide both sides of the equation by 3:

$x = \frac{15}{3} = 5$

So, the solution is $x = 5$.

Let me know if you'd like more details or if you have any questions! Here are some related questions to explore:

1. How would you solve a more complex equation with multiple terms?
2. What are the properties of equations with variables on both sides?
3. How can you solve equations involving fractions?
4. What is the difference between solving linear equations and quadratic equations?
5. What are some real-life applications of solving equations?

Tip: Always perform the same operation on both sides of an equation to maintain its equality!