Q. Simplify the following:

$\displaystyle \frac {3x^2y - 6xy}{2x^2y - 4xy^2}$

i've got up to

$\displaystyle \frac {3xy(x - 2)}{2xy(x - 2y)}$

i tried simplifying it further but i just end up getting the wrong answer, which is $\displaystyle \frac{3}{2y}$

thanks