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