Answer
$\dfrac{3x^2-9}{2x-1}; x \ne \frac{1}{2}$
Work Step by Step
The expressions are similar so subtract the numerators and copy the denominator to obtain:
$=\dfrac{3x^2-9}{2x-1}; x \ne \frac{1}{2}$
($x$ cannot be $\frac{1}{2}$ as it makes the expression undefined.)
