The equation you provided is \( 4x - 9 = 0 \) (assuming you want to solve for \( x \)). To solve for \( x \), follow these steps:
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Add 9 to both sides of the equation:
\[ 4x = 9 \]
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Divide both sides by 4:
\[ x = \frac{9}{4} \]
So, the solution is \( x = \frac{9}{4} \) or \( 2.25 \). If you meant something else or want to do further calculations, please let me know!