$$(x+2y+3)(x+2y+7)$$
$x^{2}+4xy+10x+4y^{2}+20y+21$
$$x^{2}+2xy+7x+2yx+4y^{2}+14y+3x+6y+21$$
$$x^{2}+4xy+7x+4y^{2}+14y+3x+6y+21$$
$$x^{2}+4xy+10x+4y^{2}+14y+6y+21$$
$$x^{2}+4xy+10x+4y^{2}+20y+21$$
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$\left(x+2y+3\right)\left(x+2y+7\right)$
