$$x+ \frac{ y }{ 3-x- \frac{ y }{ 2 } }$$
$\frac{2y+6x-xy-2x^{2}}{6-y-2x}$
$\frac{4x^{2}+4xy-24x+y^{2}-8y+36}{\left(6-y-2x\right)^{2}}$
