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