$$(x-y-1)(x+y+3)$$
$x^{2}+2x-y^{2}-4y-3$
$$x^{2}+xy+3x-yx-y^{2}-3y-x-y-3$$
$$x^{2}+3x-y^{2}-3y-x-y-3$$
$$x^{2}+2x-y^{2}-3y-y-3$$
$$x^{2}+2x-y^{2}-4y-3$$
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$\left(x-y-1\right)\left(x+y+3\right)$
