$$3x\times\frac{4}{8}+3\sqrt{\frac{9}{18}}-y$$
$\frac{3x-2y+3\sqrt{2}}{2}$
$$\frac{3x+3\sqrt{2}-2y}{2}$$
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$\frac{3x}{2}-y+\frac{3\sqrt{2}}{2}$
