To solve the equation $9 = 4x$ for $x$, follow these steps:

1. Isolate $x$: Divide both sides of the equation by 4. $x = \frac{9}{4}$

2. Simplify: $x = 2.25$

So, the solution is $x = 2.25$.

Would you like more details or have any questions?

Here are five related questions:

1. How would you solve $9x = 4$ for $x$?
2. What is the value of $x$ in the equation $16 = 8x$?
3. How do you solve $12 = 3x + 3$ for $x$?
4. What is the solution to $5x = 20$?
5. How do you solve the equation $7x = 14$ for $x$?

Tip: When solving linear equations, always perform the same operation on both sides to maintain equality.