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