Let's solve for $x$:

$4x - 9 = 15$

Step 1: Add 9 to both sides

$4x - 9 + 9 = 15 + 9$

$4x = 24$

Step 2: Divide both sides by 4

$x = \frac{24}{4}$

$x = 6$

Final Answer:

$\mathbf{x = 6}$

Would you like a step-by-step explanation or have any questions?

Related Questions:

1. How do you solve $5x - 7 = 18$?
2. What happens if the equation is $4x + 9 = 15$ instead?
3. How do you solve equations with fractions, like $\frac{3x}{2} - 4 = 10$?
4. What is the general method for solving linear equations?
5. How do you check if your solution is correct?

Tip:

Always check your solution by substituting it back into the original equation! 😊