$$3 \frac{ x }{ x } +6 \frac{ y }{ 2y }$$
$6$
$$3\times 1+6\times \frac{y}{2y}$$
$$3+6\times \frac{y}{2y}$$
$$3+6\times \frac{1}{2}$$
$$3+\frac{6}{2}$$
$$3+3$$
$$6$$
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$2\times 3$