$$\frac{ 1 }{ 3 } { x }^{ 2 } y- \frac{ 3 }{ 2 } x { y }^{ 2 } +3xy$$
$\frac{xy\left(2x-9y+18\right)}{6}$
$$\frac{2x^{2}y-9xy^{2}+18xy}{6}$$
$$xy\left(2x-9y+18\right)$$
$$\frac{xy\left(2x-9y+18\right)}{6}$$
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