Answer
$\frac{x-3}{2x}$
Work Step by Step
To simplify, divide both the numerator and denominator by their greatest common factor.
Use the distributive property to find the GCF.
$\frac{3x-9}{6x}=\frac{3(x-3)}{6x}=\frac{3(x-3)\div3}{6x\div3}=\frac{x-3}{2x}$