$$\frac{ 1 }{ 2 } + \frac{ 3 }{ 1 }$$
$\frac{7}{2}=3.5$
$$\frac{1}{2}+3$$
$$\frac{1}{2}+\frac{6}{2}$$
$$\frac{1+6}{2}$$
$$\frac{7}{2}$$
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$\frac{7}{2} = 3\frac{1}{2} = 3.5$